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Operator
Greetings, and welcome to the Vonage Fourth Quarter and Fiscal Year 2020 Earnings Conference Call. (Operator Instructions) As a reminder, this conference is being recorded. It is now my pleasure to introduce Hunter Blankenbaker, Vice President of Investor Relations. Thank you. You may begin.
Hunter Blankenbaker - VP of IR
Thank you, operator, and good morning, and welcome to our fourth quarter 2020 earnings conference call. Speaking on our call this morning is Rory Read, Chief Executive Officer; and Steve Lasher, Chief Financial Officer. Also joining us is Jay Bellissimo, Chief Operating Officer; Omar Javaid, President of the API Platform; Rodolpho Cardenuto, Head of Unified Communications and Contact Center; and Tim Shaughnessy, our previous Interim CFO.
Rory will discuss our strategy and fourth quarter results. And Steve will provide a more detailed view on our fourth quarter and full year results and 2021 first quarter and full year guidance. Slide that accompanies today's discussion are available on the IR website. At the conclusion of our prepared remarks, we'll be happy to take your questions.
As referenced on Slide 2, I would like to remind everyone that statements made during this call may be forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are based on management's expectations, depend on assumptions that may be incorrect or imprecise and are subject to risks and uncertainties that could cause actual results to differ materially. More information about those risks and uncertainties is highlighted on the second page of the slides and contained in our SEC filings. We caution listeners not to rely unduly on these statements and disclaim any intent or obligation to update.
During this call, we will be referring to non-GAAP financial measures. A reconciliation to GAAP is available in the fourth quarter earnings press release or the fourth quarter earnings slides posted on the IR website. Additionally, during prepared remarks today, all comparisons to prior periods are year-over-year, unless otherwise noted as sequential. So with that, I'll turn the call over to Rory.
Rory P. Read - CEO & Director
Thanks, Hunter, and thank you to everyone for joining us today. I hope you and your families are staying safe and healthy. I would like to start by thanking our Vonage team members around the world for their unwavering support and commitment to our customers during these extraordinary times. Our vision is to accelerate the world's ability to connect. And 2020 presented many opportunities to do just that and to make a real difference for our customers. We helped our customers address unprecedented challenges by finding new ways to work, connect and engage. One example is StoryCorps, the national nonprofit that has brought together more than 600,000 people to record intimate face-to-face conversation about their lives and leave a legacy. It is the world's largest single collection of human voices ever gathered, and it is preserved at the U.S. Library of Congress for generations to come.
StoryCorps asked for our help in making these human connections possible when in-person interviews were no longer an option, and we launched StoryCorps Connect. StoryCorps Connect is a free video platform powered by Vonage, created to reduce the impact of isolation and preserve people story at this monumentous point in our history. Everyone at Vonage is extremely proud of the solutions we are creating to connect people and businesses across our planet, and this is needed more than ever right now.
As we have discussed, our strategy is to leverage our single global cloud communication platform that powers our customers and partners next-generation engagement solutions using our APIs, Unified Communication and Contact Center innovations to perform better, connect easier and to create new business models. To execute on this strategy, for the past 6 months, we have focused on optimizing our business for improved operational efficiency. This has allowed us to make strategic investments to drive growth, and we are starting to see the initial results of this work. In parallel, we have established our strategic operating plan for the next 3 years.
Today, I'll focus my comments on 3 areas: one, our solid fourth quarter results; two, our 2021 product and go-to-market investment activities; and three, an update on the sale of our consumer business. Steve Lasher, our new CFO, will follow with a more detailed look at the quarter and full year as well as our 2021 guidance.
I'll start with the fourth quarter financial results. Vonage Communication Platform total revenues were $245 million, with service revenues of $230 million, a 17% increase year-over-year. Within this result, API revenues grew 33% year-over-year, highlighted by high-value APIs and our Unified Communications and Contact Center application service revenues grew 4%, again, slightly ahead of expectations. Consolidated revenues totaled $323 million, and we delivered adjusted EBITDA of $48 million. Both above expectations.
As committed, we announced this morning that we are making important new disclosures on our Vonage Communications Platform operating expense and adjusted EBITDA. This is to provide greater transparency to help our investors better understand and value our business and to enable them to track our progress on the Rule of 40 as calculated by VCP's service revenue growth percentage plus its adjusted EBITDA margin. We exited the fourth quarter of 2020 with a VCP Rule of 40 of 15%. We are committed to steadily and improve our Rule of 40 results over the next 3 years. We expect to exit fiscal 2021 in the 20% range. And our plan for 2022 is to be in the mid-20s range and above 30% in 2023.
I'll now provide a few fourth quarter highlights by products, starting with API. Revenues grew 33% year-over-year to $119 million. We saw momentum in nearly every industry as digital communication channels have become a primary differentiator in the way businesses engage customers. API product strength was driven by 3 key areas: first, high-value APIs grew 130% year-over-year, with voice and video usage accelerating sequentially as customers continue to expand on our platform; second, dollar-based net expansion increased to 121%, driven by momentum across most industries. We are also seeing additional improvement in travel and hospitality; and third, we remain well positioned with global scale and a diverse customer set across the world in multiple industries, including health care, education, gaming, social and virtual events, providing a broad-based balanced growth trajectory.
I'll now highlight virtual events. Vonage powers more than a dozen virtual events platforms on multiple continents. We signed several large customers in fourth quarter, winning against both competitors who offer simple video conferencing solutions and other CPaaS companies. SpotMe is a new Vonage customer that provides event solutions to more than 250 global brands, including Daimler, SAP and Johnson & Johnson. Disrupted by the pandemic, SpotMe needed to build an online platform to keep operating and to meet customer needs. They chose Vonage because of our high-quality video API, ability to enable real-time streaming and our secure platform with global reach.
Now moving to Unified Communications and Contact Center products, service revenues grew 4%. Fourth quarter bookings were up sequentially for the second quarter in a row, but remained slightly down year-to-year. Within this, mid-market and enterprise bookings were up and accounted for more than half of our total bookings. We continue to see traction in cross-sales not only in Unified Communications and Contact Center products, but also in combination with our programmable APIs as we work with our customers to help them drive better business outcomes. One example is Gannett Co. Inc., the largest U.S. newspaper publisher. Gannett had several disparate on-site PBX systems from multiple acquisitions. They wanted a platform that unified all team members and provided the flexibility to work from anywhere, while delivering voice, video, messaging and social media from a single user interface.
They chose Vonage for our integrated Unified Communications and Contact Center solutions that seamlessly integrate with their productivity and CRM applications as well as our ability to scale with them using our communication APIs. Another example is Great Wolf Resorts, a brand leader in the indoor family water park resorts category. Great Wolf chose Vonage because it needed a partner that can provide a Contact Center solution with deep Salesforce integration and help them create a differentiated user experience. Great Wolf is using our Vonage contact center solution along with our AI capabilities and programmable voice and messaging APIs to offer new, customized and interactive engagement experiences for all of their guests.
We expect our improving bookings trajectory to continue throughout 2021 and translate into increasing Unified Communication and Contact Center growth rate in the second half of the year. 2021 will be a year of execution and targeted growth as we further invest in our product development and a tailored go-to-market so we can provide our customers with the communication solutions that best fit their need and win a disproportional share of the market. I'm confident we are putting the right sales structure and strategy in place. Our new e-commerce platform and self-service capabilities for micro and small business markets, our new cost-effective ways to scale growth will augment this with a more strategic focus on enterprise and VCP cross-selling, leveraging our strong direct sales force.
The channel is a key part of our growth strategy, and we started building a stronger channel foundation in 2020. We will make further investments in 2021 to differentiate our channel program with additional support in key markets, new incentives, product innovation and new infrastructure that will make it even easier to partner and win with Vonage. Finally, as we committed, we have completed a comprehensive 9-month strategic review of the consumer business through the assistance of financial, accounting and legal advisers. Based on this review, which included a detailed analysis of the consumer business financials, profitability and potential valuation, the Vonage Board has determined that it is in the best interest of our company's shareholders to terminate the sales process and retain the consumer business. We have reached out to approximately 70 strategic and financial sponsors to gauge their interest in a potential acquisition of the consumer business. A number of the potential acquirers express interest in the business, but none at the value that the Board believed was acceptable to move forward with a sales transaction.
Our decision was driven by valuation and $600 million of cash generation we expect from consumer over the next 5 years. We can run this business easily, efficiently and without distraction. Moreover, this decision ensures a strong balance sheet and financial flexibility to invest in VCP capabilities and potential M&A. Importantly, the detailed financial reporting now available will enable investor to evaluate VCP in a manner comparable to a stand-alone business.
In closing, Vonage is in the right place at the right time in a large and growing market. We have improved the business over the last 6 months by creating operational efficiencies that allow us to invest in growth opportunities and to consistently execute on our commitment. We will focus our execution on efficiently delivering a compelling solution portfolio in attractive market to create differentiated value to our customers. We are making solid early progress, but we have much more work to do to build an even better Vonage. We are committed to delivering improved growth and profitability across 2021, and we'll drive further efficiencies and growth opportunities as we scale our business in 2022 and 2023. We look forward to sharing more details during our Analyst Day on March 5.
I am pleased to enter this important year with a strong leadership team, enhanced by our critical senior leadership hire since our last earnings call. With this leadership team now in place, we are set to execute. Jay Bellissimo joined us as Chief Operating Officer, leading sales, operations and our go-to-market strategy across the Vonage Communications Platform. He has deep knowledge and operational expertise in software-as-a-service, cloud solutions and artificial intelligence with a proven track record of helping organizations accelerate digital and business transformation effort by moving to the cloud. Steve Lasher, who we introduced earlier in the call has joined as our new Chief Financial Officer. Steve's deep knowledge of technology and the software space and a long history of leadership in finance, business transformation and business development will make a significant impact on helping Vonage drive revenue growth and increase profitability, while we invest to strengthen our innovation capability, to create differentiated value for our customers.
And we announced yesterday that Savinay Berry will join as Executive Vice President of Product and Engineering, responsible for the global leadership of Vonage's engineering, product management, IT and security team, focused on driving the company's technology strategy and innovation of the Vonage Communication Platform and its portfolio solutions. Savinay has extensive experience in technology, software and the cloud, with a track record of developing highly innovative products and spearheading results-driven transformational change. Each of these executives have deep cloud and SaaS experience with a long history of demonstrating results in building growth businesses at scale.
Before turning the call over to Steve, I'd like to thank Tim Shaughnessy for his strong work as our interim CFO, which has helped us to become more efficient and develop better operational execution. He has also played a key role in the consumer review and driving greater transparency in our financial reporting. Thank you, Tim. And with that, I'll turn the call over to Steve.
Stephen A. Lasher - CFO
Good morning, everyone, and thank you, Rory, for the warm introduction. I'm honored and excited to be the CFO of Vonage. I believe there is a huge opportunity in front of us, and I am looking forward to working with Rory and the leadership team to capture more market share while driving operational excellence and profitability.
Turning to our results. I'll cover the following topics: first, I'll begin with a brief discussion of our consolidated Q4 and full year 2020 performance; second, as Rory mentioned, this quarter, we began providing additional disclosures on our Vonage Communications Platform and Consumer segment. So I'll review these results in more detail; and third, I'll cover our first quarter and full year 2021 guidance. And with that, let me dive right in, beginning on Slide 7. Consolidated revenues of $323 million increased 4%, driven by a 12% increase in VCP revenues, offset by declines in consumer. For the full year, consolidated revenues were $1.2 billion, a 5% increase. Fourth quarter consolidated gross margin was 54%, down slightly due to the faster growth of relatively lower margin VCP revenue, which now represent 76% of consolidated revenue up from 70% in the prior year. Consolidated operating expenses were $169 million, down 1% year-over-year, improving our expense to revenue ratio by 3 points, as we continue to optimize the business for faster growth and improved profitability.
I'll discuss OpEx in more detail in our segment results. Consolidated fourth quarter adjusted EBITDA of $48 million was up $3 million year-over-year due to improving revenue performance and cost structure actions. For the full year, adjusted EBITDA was $170 million, an 8% increase.
Before turning to segment results, I would like to highlight that we've included an 8-quarter historical view of the VCP and consumer segment on Slide 16 and 17 in the earnings presentation. Now let's review fourth quarter VCP segment results beginning on Slide 8. VCP service revenues increased 17% to $230 million. Service revenues exclude product, access circuits and USF fees, which totaled $15 million in Q4, down $7 million. Full year 2020 VCP Service revenues were $856 million, a 19% increase. Within VCP, API revenues all of which are serviced were $190 million in the fourth quarter, up 33%. High-value APIs grew 130% year-over-year, with particular strength in video, voice and IP messaging. High-value APIs represented roughly 20% of the total API revenue. Unified Communications and Contact Center service revenues were $111 million in the fourth quarter, up 4%. VCP revenue churn was 1.3% in the fourth quarter. Churn within UC and CC was at record lows. However, this was offset by higher churn on our API platform, driven by a loss of certain customer traffic in Asia due to government regulations. Monthly service revenue per customer increased 16% to $552 due to increases in average customer size across the VCP platform.
Moving to Slide 9. VCP gross margin in the fourth quarter was 46%, down 100 basis points year-over-year, driven by mixed dynamics within the quarter. For the full year, VCP gross margins were 48%, up 100 basis points. VCP sales and marketing expense for the fourth quarter was $77 million, down $7 million versus the prior year and down $6 million sequentially, due to our business optimization effort to improve the efficiency of our sales and marketing. This was offset by selective investments into our API sales team. VCP engineering and development expenses were $20 million, up 22%, reflecting increased investment on the VCP platform, including video and voice functionality and scalability. E&D expenses plus capitalized software totaled $32 million, which represents 14% of VCP service revenue. VCP general and administrative expenses for the fourth quarter was $38 million, up $2 million due to higher restructuring charges, primarily related to lease abandonments and consulting fees on the consumer strategic review. VCP adjusted EBITDA was negative $4 million, improving from negative $18 million in the prior year and negative $14 million in the third quarter. VCP adjusted EBITDA benefited from our efforts to drive greater operational efficiencies while growing revenue.
Moving to Slide 10. Consumer segment revenues were $79 million in the fourth quarter and totaled $333 million for the full year, a 14% decrease. We ended the quarter with approximately 900,000 consumer subscriber lines. 2-year plus tenured customers now represent 94% of our consumer base, and 5-year plus customers are 79%, which has churn rate of 1.6% and 1.5%, respectively. Consumers average monthly revenue per line was $28.13, up $0.56, reflecting higher USF fees and targeted price increases that we implemented during the year. Churn of 1.7% was stable compared to the prior year quarter and down 10 basis points sequentially. Consumer adjusted EBITDA was $52 million in the fourth quarter and $227 million for the full year. This business provides profitability and cash generation, which helped fuel our growth initiatives.
On Slide 11, we ended the fourth quarter with $517 million of net debt, down $20 million sequentially. As of December 31, net debt was 3x last 12 months adjusted EBITDA. Given the strong cash flows, of the consumer business and improving cash flow of VCP, we expect to continue to pay down debt in 2021, ending the year below 2.5x.
Moving on to guidance on Slide 12. For the first quarter, we expect Vonage Communication Platform revenues in the range of $240 million to $244 million. We expect Vonage Communication Platform service revenue growth of approximately 16% to 18%. Embedded in this guidance are the following trends: in API, we expect first quarter year-over-year growth in the 34% to 36% range, reflecting continued positive trends in high-value and messaging; with regard to Unified Communications and Contact Center, we expect service revenue growth in the low single digits. We believe first quarter service revenue represents the trough of the UC and CC growth rate decline and that we will see a modest improvement in growth rate in each quarter of 2021 thereafter. We expect first quarter VCP adjusted EBITDA to be in the range of negative $7 million to negative $3 million. Within consumer, we expect revenues in the $75 million range and adjusted EBITDA of approximately $49 million. On a consolidated basis, we expect total revenue of $314 million to $318 million and adjusted EBITDA in the $42 million to $46 million range, with a sequential decline due to the reset of annual employee benefit and a step-up in sales and marketing activity.
For the full year, we expect Vonage Communication Platform total revenues in the range of $1.038 billion to $1.054 billion. Within this, we expect service revenue growth of 15% to 17%, driven by API growth approaching 30%, and UC and CC service revenue growth in the low to mid-single digits. We expect VCP adjusted EBITDA to be positive for the full year of 2021 in the $5 million to $9 million range, a substantial increase from negative $57 million in 2020, reflecting our focus on continued operational efficiencies. For consumer, we expect 2021 revenue in the $285 million range and adjusted EBITDA in the $185 million to $189 million range. Total consolidated revenues are expected to be in the range of $1.323 billion to $1.339 billion. We expect full year 2021 adjusted EBITDA in the $190 million to the $200 million range. With that, I'll turn it over to the operator to initiate the Q&A.
Operator
(Operator Instructions) Our first question has come from the line of Ryan MacWilliams with Stephens.
Ryan Patrick MacWilliams - Research Analyst
So just to dig in to start on the consumer division, how are the interest levels during the sales process? And what was the valuation that you were trying to achieve here? And just given how extensive this review was, does this really close the book on Vonage potentially selling its consumer business?
Rory P. Read - CEO & Director
Ryan, thank you for the question. There's no question, we went through a comprehensive strategic review. First, we had to understand, and we brought in accounting and professional consultants to really dissect the business and pull it apart because it's always been our intention to give greater transparency to our investors so that they could understand VCP, the Vonage Communication Platform and the Consumer business. It was definitely robust approaching 70 strategic and financial sponsor. There's no question. We went through 2 rounds of discussion. And we had quite a number of interest. But at the end of the day, Ryan, it really comes down to -- this is a very efficient access of capital for us. We can run it efficiently without distraction and this gives us real flexibility as we continue the strategic pivot of Vonage from its traditional heritage to this leader in the global communication platform space. There's no question we'll continue to invest in VCP to drive faster growth.
As I mentioned in the progression of the Rule of 40 over the next 3 years. And that's something we'll dig into at the Analyst Day on March 5. But I believe that this is clearly the right decision. And clearly, we closed the book on this one. End of discussion.
Ryan Patrick MacWilliams - Research Analyst
And the guidance for positive adjusted EBITDA for VCP was a nice surprise, especially like thinking about some of the wins in the video API segment. But since you are keeping Consumer and its cash flow, why is it important to you to have this positive adjusted EBITDA next year for VCP? And why not drive even more investment through the API business in fiscal '21 to accelerate growth?
Rory P. Read - CEO & Director
Yes. It's just modestly positive, Ryan. There's no question about it. And we want to keep it in that range. The optimal model in terms of VCP is always going to be focused on growth at the top in terms of the service revenue. I want to make that strategic pivot. But we also, over the course of the next 2-, 3-year journey is to make sure that business is very sustainable on an ongoing basis and can fund the investment and growth that we really want to drive in that space. We're not going to go heavy on the bottom line in terms of driving it. You're going to see, we've tried to keep our firepower in terms of marketing and sales investment quarter after quarter this year to continue to improve that growth trajectory, right? And the work from Jay Bellissimo and his team as they come on with Rodolpho and Omar, Joy Corso on the sales -- on the marketing side, you're going to see us invest in velocity marketing to drive UC and CC and cross-sell, and you're going to see continued focus to extend that API momentum as we go forward.
I think that's a really important part of the ongoing strategic direction of the company. This is not a bottom line, as you mentioned, focus. We're going to keep it in that general range, but then continue to focus on capturing more growth, accelerating the business over the next 2, 3 years as we've improved our efficiency. And at the same time, Ryan, invest in product innovation this year and next, so that in '22 and '23, those years become the year of the product. And those product enhancements give our next leg up in terms of additional product growth. That's where we're going, and that's the strategy we're on.
Operator
Our next question is coming from the line of Tim Horan with Oppenheimer.
Timothy Kelly Horan - MD & Senior Analyst
Can we delve into the API a little bit more? We're seeing kind of viral growth from a bunch of more developer platform-focused business models out there. Is this still an important part of the strategy? And maybe used to give kind of developer numbers that were working on the platform, can you give us an update there?
Rory P. Read - CEO & Director
Tim, from the standpoint of API, no question of about it. It's a key component of the strategy. The Vonage Communication Platform is built on that API platform. And really leverages those APIs to build once and sell many across the purpose-built capabilities. We see that same kind of momentum. And you saw Steve's comments about continued strong growth as you kind of looked at 1Q. We don't know exactly how the moderation of the pandemic will occur, and we all hope that it moderates as soon as possible. But there's no question that the market and the way people work has changed forever, and it will continue to be more and more virtually based and more and more communications-driven. So we think we're at the beginning of a 5- to 7-year trend in this kind of programming technique and this kind of approach around API. You're going to see us continue to invest in that platform, using the dollars and capabilities of the business to enable us to continue to grow that. And you're going to see that. I think we'll take a piece on the developer background at the Analyst Day, so we could kind of go deeper there. Jay, Omar, anything you want to add in terms of API going forward?
Joseph Anthony Bellissimo - COO
Rory, it's Jay. I would just add also that we've got great diversity. When you look at our balance across the geographies, APAC, 39% of our revenue; Americas, 38%; and EMEA, 23%. And we see a lot of great opportunity to really go across the geos and go deep in those geos. And that's providing some really good year-over-year momentum as well as quarter-to-quarter momentum. So we see a very positive outlook in terms of building that. And then the other point I'd highlight is just the customer expansion. We're seeing more and more customers engage and use the wider portfolio of our APIs. With that, over to you, Omar.
Omar Javaid - President of API Platform Group
Thank you, Jay. And great question. I'm glad that you recognize the power of the developer community. So I'll just share some insights there for you. We have the second-largest developer ecosystem in the space. We have over 1 million registered developers. And just to give you some recent facts here. We've got, I think, recently about 3.1 million documentation views, 10.3 million SDK installs, representing about 13.5 billion API requests. And as Rory mentioned, we are going to be highlighting a lot of this and go through this in a lot more detail in the Investor Day. But this is an area that we have been investing in for quite some time, and we see a lot of great momentum from it.
Operator
Our next question is coming from the line of Rich Valera with Needham & Company.
Richard Frank Valera - Senior Analyst
At the risk of, I guess, front-running the Analyst Day, I'm going to ask a couple of questions on the apps business. First, I know you've had some initiatives to kind of shore up the base of that business, particularly the VBE cohort and the micro SMB component. So I wanted to just kind of get your status updates on those initiatives. Have you seen some stabilization or improvement in that part of the base? And then just high level in terms of how you're thinking about go-to-market for MME there. I know historically, you've really been aligned with Salesforce and going after accounts that were sort of standardized on Salesforce and leveraging that integration. Can you give us any high-level thoughts about how you're thinking about going to market and MME going forward?
Rory P. Read - CEO & Director
Thanks, Rich. Rich, there's no question that the focus to tailor that go-to-market by customer segment where the products best fit and where we apply the right go-to-market is the right strategy. You're going to see us continue to build out this self-service and e-commerce at the bottom of that and the micro and beginning with small, then you're going to see a lot of work around the channel, particularly in the second and third quarter as we introduce new capabilities, new incentives, new programs make it easier and better to win with Vonage and then that powerful Salesforce, that's what's going to drive that direct sales force at the top of the stack at mid- and enterprise. It's tailoring to each area to get the efficiency.
And then the work that Joy Corso is doing from our CMO perspective, to drive the velocity marketing, particularly across micro, small and mid, we're seeing some really interesting traction on some investments that we've done here in the first quarter. And as we get that information, we'll accelerate that through the balance of the year. So why don't I pass that over to Jay and Rodolpho, just to add a little bit more color.
Joseph Anthony Bellissimo - COO
Rodolpho, do you want to start?
Rodolpho C. Cardenuto - President of Applications Group
Yes. Thank you for the question. Let me -- I think you commented about the VBE and the micro business. It's important to knowledge that we are bending the curve, as you see in the revenue progression since Q2 last year. We have been progressing from Q2 to Q3 and Q4, and we expect that to continue in -- during this year. This is because we are bending the curve in VBE and micro business. One important thing to notice in terms of the micro investments that we did in the e-commerce. Now we have an easy acquisition for our customers using e-commerce, self-provisioning so -- easy provisioning for the customer and self-support also. Those were the process and that we implemented to make a micro business very profitable and grow for us.
And in terms of Salesforce, we are doubling down with Salesforce. We have the best experience with Salesforce now, but we are also implementing and actually evolving with ServiceNow and Microsoft. With Microsoft, we have the 2 connections now, Microsoft Teams and Microsoft Dynamics. We have a very good integration with Microsoft Teams and used key solutions, and we have a very good solution also for Microsoft Dynamics with TCaaS solutions, not to mention the ServiceNow that we are getting a lot of attractions with them. So we are moving from -- doubling down with the Salesforce contact center, but also moving with the ServiceNow and solutions with Microsoft.
Joseph Anthony Bellissimo - COO
I'm sorry, I was just going to add a couple of quick points to Rodolpho. A couple of other things for the portfolio in the UC and CC space, is we've seen some really good sequential growth in the bookings, and we're planning to exit the year in the high single digits in service revenue. And with that, we expect next year's service revenue to be in double digits based on the trends we're seeing today. Obviously, there are some unknowns with the impacts of pandemic, but we're feeling good about this business and the growth. And to Rodolpho's point, yes, Salesforce has been a key part. But as he alluded to, we're also looking at the partnerships with ServiceNow and Microsoft. Over to you, Rory.
Rory P. Read - CEO & Director
Yes. And Jay, I think that's an important point. What you want to do look, Rich, is let's see -- and we talked in Steve's comment that looks for the trough in 1Q. And then we should see year-to-year bookings growth starting in 2Q. We should see a steady improvement into the mid-, high single digits in the 2021 time frame. And as we look into next year, I think we can get into that low mid-double-digit growth rate in '22 as we continue to progress through this transition.
Operator
Our next question comes from the line of Meta Marshall with Morgan Stanley.
Meta A. Marshall - VP
Great. Just a little bit more on the UCC business. Just is there any different trends that you're seeing between maybe the contact center piece of the business and the UC piece of the business? I know they're fairly well integrated at this point. But just any commentary there? And then the second piece would be just on kind of the gross margin. Clearly, you're doing well with the higher-margin API business -- or you're seeing a lot of growth kind of in that higher value API business, but the gross margins of the segment just continue to kind of fall off. So just what are we seeing in terms of the competitiveness or the margins of the rest of the API business?
Rory P. Read - CEO & Director
Thanks, Meta. This is Rory. So first comment would be on the UC, CC. We're seeing some very good cross-sell activity across that portfolio. And again, where we see the CC strength it's definitely in mid- and enterprise where we can definitely leverage the strength of our direct sales force to go to market. UC, we have, it's not only there on that cross-sell, but then across the bottom of mid-, small and into micro, where we're going to use those more efficient techniques with the channel and with e-commerce to drive that growth. I think CC is -- continues to have strength, particularly as it's related around Salesforce and then the expansion of the TAM with ServiceNow and Microsoft, that opens up more opportunity. That's really going to be a direct Vonage sales play and to leverage that continued growth.
And when we gave those kind of feel for the next several quarters that movement of the business is really a UC, CC combination going from the trough here in low single digits into the mid- and high single digits across the 2021 time period and then further in '22. But I'll let Steve Lasher give an update on gross margin, I think to give you a feel for where we're sitting on that. Steve?
Stephen A. Lasher - CFO
Great. Thank you, Rory. And thank you, Meta, for the question. As we look at our VCP gross margins, when we take a look at first at where we are, we had strong growth in API, 33% growth from a revenue perspective. And then also from a UC, CC perspective, 4% growth. And if you look at the margins across the products, they were relatively stable. And it purely is a mix within our product offerings within there. So again, with the mix within the API-oriented businesses, our goal is obviously to improve margin. But we're really looking to drive the API scale as we go forward. And I really think that as we continue to expand the business, get -- and use the power of the global reach and the portfolio, we will also, at the same time, look to improve the margins as we go forward.
Operator
Our next question has come from the line of James Breen with William Blair.
James Dennis Breen - Communication Services Analyst
Just a couple. One on the balance sheet side, I think you said that you're looking to get below sort of 2.5x leverage sort of implies paying off around $30 million or so of debt this year. Is that sort of the goal, operating cash flow generation on the consumer side is around $120 million based on your estimates and sort of running VCP at breakeven?
Rory P. Read - CEO & Director
Steve?
Stephen A. Lasher - CFO
Yes. Sure. Thank you very much, really, for the question. We are. As we look to continue to operationalize the business, we are looking to pay down debt. Obviously, we want to make sure we are optimizing the business. And if there are other opportunities for acquisition or the like, we will make sure we prioritize those. But as you've seen, we've made some real strong improvement in our profitability. And as we've given the guidance as we move forward towards the end of 2021, we want to be second half profitable and full year profitable. So again, within that, we're going to evaluate what do we do and continue to pay down the debt is one of our priorities.
Rory P. Read - CEO & Director
And again, on that one, really, the focus, again, is if there's opportunities for us to do strategic M&A, we're going to look at that hard. And then also the work to invest for faster growth across VCP. This gives us more firepower and more flexibility.
James Dennis Breen - Communication Services Analyst
And then just on the sales side, relative relationship with channel partners and agents, et cetera, how -- can you just give us some color on how that's progressed maybe quarter-to-quarter, year-over-year in terms of being invited into more deals and maybe the win rate?
Rory P. Read - CEO & Director
Yes. So from the standpoint of the channel, I spent a lot of time over the past 6 months meeting with various channel partners across the ecosystem to really understand how to be a better partner with those channel partners and what would create that momentum. Both Rodolpho and Jay have a long track record of leveraging the exponential power of the channel to drive growth, to drive expansion while we're sleeping across the planet, right? That's the power of the channel. We targeted and looked at our products, our portfolios, our documentation over the last 4 or 5 months. We're making changes to all of that additional capabilities, and then we're working right now with -- in concert with feedback from our channel partners on the right next set of incentives and really drive that growth.
You'll see that launch for 2Q, and then we'll see us continue to build that out this year. It's -- suffice it to say that this is going to continue to be an even more important driver of our growth. As you see us move up that curve from a VCP Rule of 40 exit of 2020 at 15% at 2021 at the 20% range, and then in 2022 in the mid-20s. That is a key piece of it. So you're spot on that, and we'll look forward to giving you updates as we go forward.
Operator
Our next question comes from the line of Mike Latimore with Northland Capital Markets.
Michael James Latimore - MD & Senior Research Analyst
Great. I guess just 2 questions here. You just threw out the notion of strategic M&A. I guess, can you give a little more detail on what you're thinking as a potential kind of criteria there. It seems like your product portfolio is pretty well-rounded out now. So just kind of curious what you might think about in terms of strategic M&A? And then second, in terms of new bookings opportunities for your API business, how important is this notion of cross-selling into the application base there? It seems like a lot of the growth is just coming from direct at this point.
Rory P. Read - CEO & Director
Sure. So let's talk about M&A. M&A is opportunistic. We always are looking to potentially augment our technical innovations, and there's lots of opportunities out there. But it has to make sense. If it expands our reach, our revenue base and our capabilities in terms of routes, that's also attractive. At this point, we've done a really good job over the past 3, 4 years and strategically pivoting the business, Vonage Communication Platform. I think we've got the base products, as you pointed out, Mike. I think if there's any of that activity. It's opening up market expansion and TAM where it's augmenting technical innovation. It's going to be opportunistic, and we're going to look at that going forward. Then from the API standpoint, I'll swing it over to Omar.
Omar Javaid - President of API Platform Group
Mark, thank you for the question. I think what you were asking for, how big is the opportunity in cross-selling APIs to apps and vice versa versus focusing on APIs. I think as we've laid out even before, the opportunity within API is very strong. We continue to focus on it. Rory, Jay and team, I candidly wouldn't have it any other way. However, we see -- we've invested a great deal, and we have a strong customer base on the app side, and it would behoove us to figure out how to become stronger at selling those solutions within those customers. So I think that's an opportunity. But we are very, very focused on being great at the API business as well.
Operator
Our next question comes from the line of Catharine Trebnick with Dougherty.
Catharine Anne Trebnick - VP & Senior Research Analyst
Yes. No, sorry. I had you on mute. I have 2. One is, it seems you have added a lot of the senior management team recently. Are you moving to a more traditional management structure with CTO, engineering, sales and marketing and away from more what was happening a year ago where you had 2 centers of power, I would say, with API and then the UC, CC Group. I'm just trying to understand the new organization structure and how that pans out for responsibilities and roles?
Rory P. Read - CEO & Director
Sure, Catharine. There's no question. I love the power of the Vonage Communication Platform, an API-based platform with global reach, leveraging this global carrier network, a cloud-based infrastructure around the world. We can reach any customer, any partner, anywhere. And our APIs give us this buildable base and these purpose-built applications built on top of it. And UC and CC, that's the power of Vonage. It's diverse in terms of the geography, representation of revenue, the industry representation, let's leverage that. That's the power and one of the differentiators of Vonage. And when you have the opportunity and you get into this, and we're going to drive a culture around accountability, collaboration, trust and driving excellence. We're going to do what we say and own what we do. And that's going to be our culture. Want to make sure that we augment an already strong senior leadership team with really amazing talent. I mean first, Joy joins us in terms of CMO. Then we go and get Jay, Steve Lasher, look at the scale there. And then Savinay Berry just yesterday.
These are opportunities and combination with the skills that we already have on board that are now building a company not for today, but for the next 3 years and the next 5 years. That's the kind of idea that we're tackling here. And we want to leverage that Vonage Communication. That's what customers are looking for. Communications are going to rule the day over the next 5 to 7 years. We're in the right place at the right time with the right team. And then under that, the technical team that we have in engineering and product, I'll go into any battle with that team anywhere. Thanks, Catharine.
Catharine Anne Trebnick - VP & Senior Research Analyst
Yes. And then the follow-up is, could you parse for us what the high-value API gross margins are? I know at one point in time, I was thinking the video API was around 60%. Any possibility you can parse some of that information out for us?
Rory P. Read - CEO & Director
Yes. At the product level, we're not going to kind of get into that kind of level. Suffice to say, high value is definitely on the higher end of the portfolio in terms of the mix. There's no question. And we're growing a higher and higher percentage of that as we go forward. But there's no question. It's the power of VCP. And with the new disclosures now, you can see that business much more clearly over the past several years, how that's progressing and growing. And then with the work that we're going to do at Analyst Day, we kind of set the vision for where we're going to go over the next 3 years.
Operator
Our next question comes from the line of George Sutton with Craig-Hallum.
George Frederick Sutton - Partner, Co-Director of Research & Senior Research Analyst
Rory, you gave about a 1,500 basis point suggestion of improvement in your Rule of 40 over the next 3 years. I wondered if you could just break that down into growth versus margin plans.
Rory P. Read - CEO & Director
George, how you got to look at that as we kind of talked about at the beginning with Ryan, growth has to be the optimal driver. In an optimal kind of model, if we were looking 3 years down -- 3 years down is a ways away. But as you go for that 30% or better number in that time frame, you're going to want to look for something in that mid-20s range on growth. Obviously, higher is better, but that part. And then you want to be in that mid-single-digit on the bottom. There's no question that the opportunity is on the growth side. We're in the high teens today on VCP revenue growth. We need to accelerate that over the next several years. Bottom line, there's lots of ways to make those numbers, but we definitely want to orient ourselves towards that growth driver. Does that help, George?
George Frederick Sutton - Partner, Co-Director of Research & Senior Research Analyst
That's very helpful.
Operator
Our next question comes from the line of Will Power with Baird & Co.
William Verity Power - Senior Research Analyst
Okay. Great. I guess a couple I'll try to sneak in here. I guess, Rory, now that you've concluded the consumer strategic review, I wonder if you could just remind us of the strategic importance of having API and the UC contact center businesses together, how intertwined are those and could it make any sense to look at strategic alternatives for the UC Contact Center business just to help shine a brighter light on the API segment?
Rory P. Read - CEO & Director
From my standpoint, Will, there's no question we're better together. The power of Vonage is in that reach and scope. I have no hesitation at that at all. The Vonage Communication Platform will be based on API-based platform. And we're going to use that global carrier network, that global infrastructure reach to be able to reach any customer anywhere, anywhere around the planet. And then what we're going to do is use those APIs and build those ones and then build those into the UC and CC capabilities as we move forward. Sure. There's no question that there's some different sellers but we already are seeing examples, and I referenced a couple in the prepared remarks, where customers are definitely seeing the power of UC and CC in that combination, and we're seeing a lot more in terms of our Salesforce flow in terms of combined cross-sell opportunities. But then they love the API work to build out and give them scale and reach as they build out this communications reach. Does that help?
William Verity Power - Senior Research Analyst
Yes. No, that helps. I guess maybe just a second quick follow-up. As we look at the API segment and guidance, I think you all are expecting an acceleration in revenue growth from what was just reported. So I'd love any further color as to kind of the key drivers behind the API outlook.
Rory P. Read - CEO & Director
There's no question from an API standpoint. We've seen some impact in the -- from the pandemic around hospitality and travel. But we've also seen acceleration in video and voice and verification and some of the others. It's a little bit hard to predict how the moderation of the pandemic will occur across 2021. We all want it to moderate. It's the best. There's no question that this change way -- in the way business is done is going to continue. But I think that kind of momentum is just going to continue to go. And what we've done is prudently look at the full year balancing what we're seeing in the short term with the unknown of the moderation of the pandemic. At the end of the day, we want to make sure we're delivering information that we are going to execute on and execute with excellence.
Operator
Our next questions come from the line of Michael Rollins with Citi.
Michael Ian Rollins - Research Analyst
Two, if I could. First, I was curious if you could provide an update on how you see the addressable markets in terms of revenue for the key product categories, if you were to look out over the next 3 to 5 years and just take into account the evolving ways in which enterprise firms and their customers are engaging with each other? And then the second question goes back to just the management of the business. And curious if you're going to run -- now that you've done the strategic review, you illuminated more financial disclosures for consumer. Are you going to run Consumers essentially a company -- a smaller company within the Vonage portfolio? And it will have its own balance sheet and its own specific objectives that are separate from the way you run and manage VCP?
Rory P. Read - CEO & Director
Yes. So Michael, I'll take the second one first, and then you can remind me of the first one, guys, on the screen. The second one, in terms of the consumer business, in terms of that, we definitely run that almost as a separate business today. There is some synergies across that, but they're relatively minor. This runs well. It's efficient. We have a strong, small team that's working that. And I believe that we can run that business with -- well and without distraction. So you should think about that as a separate business segment set off to the side running where it makes sense. We'll use some synergies. But for the most part, that's pretty stand-alone.
And then the market opportunity around API. That in terms of -- and in terms of the Vonage Communication Platform, there's no question. From my standpoint, it's the reason I came to Vonage. I believe that this is a secular change in the way communication and programming is done across multiple modes of communication to embed in every workflow, every application, every business process. It's going to change. And the pandemic, as unfortunate as it's been, has only accelerated that. And we're going to see that continue to happen for the next 3 to 5 years. We are in the right place at the right time.
Operator
Our next questions come from the line of Samad Samana with Jefferies.
Samad Saleem Samana - Equity Analyst
I'll just squeeze one in since we're already over the 9:30 mark. But if I think about the changes in the senior management team, as you mentioned, you've deepened the bench, you've made a lot of changes over the last 18 months. How should we think about maybe the turnover rate in the quota-carrying sales rep organization? And maybe what was the churn or retention there in 2020? And how should we think about in terms of backfilling or supplementing that in 2021? And then just -- I know you have an Analyst Day coming up in a few weeks and don't want to steal the thunder from that. But maybe how should we think about any additional strategic changes as it relates to the management of the business?
Rory P. Read - CEO & Director
Yes. I feel good about the org structure and how we built the leadership team. As there can always be small modifications, we've done the major work over the past 6 months. I think with the 4 additions, I think we're in the right place. In terms of the first question, and Samad, you talked about our sales team. My experience in every business I've ever been part of, the #1 driver of sales productivity and the reason you're asking it is spot on. It's time and patch. We've seen strong continued flow-through. So the longer someone is selling our products and our capabilities, the more productivity they have.
We want to create that environment where they want to be part of that and continue to grow with the business. We've seen at/or below industry levels of attrition over the past 2 years and over the past 12 months, it's actually declined. But it's something that -- I know Jay believes in big time in terms of driving that productivity comes from time and patch, and we're going to definitely manage that. So the data on that one, you should think that we're having the team at industry or lower attrition rates. And that we're keeping those players focused to grow that business.
Operator
Our next question comes from the line of Sterling Auty with JPMorgan.
Drew Elizabeth Glaeser - Research Analyst
This is Drew on for Sterling. You've mentioned this e-commerce self-service platform that will drive growth with micro businesses and SMBs. Is that a completely new solution? And if so, could you provide some more color on the strategy surrounding that?
Rory P. Read - CEO & Director
Sure, Drew. Great question. And I really want to emphasize there's 2 pieces to it. It's not only the capabilities that we introduced over the past several quarters. It's something of the strategy that Rodolpho has been on and building out and at micro in the beginning of small segment. The other part of it is the work that Joy Corso and the marketing team are doing to drive velocity marketing around that. And as I mentioned, in first quarter, we've implemented a number of new marketing -- velocity marketing tactics, and we're seeing some very good signs. We're going to double down on that to drive that growth. But that's been our strategy since Rodolpho got here at the end of 2019, and he's been driving that change. We'll cover that in a little bit more detail at the Analyst Day.
Operator
Thank you. There are no further questions at this time. I would like to turn the call back over to Rory Read for any closing comments.
Rory P. Read - CEO & Director
Hey, I want to say thank you to everyone for participating. As committed, we communicated greater and more transparent disclosures. We closed on the strategic review of Consumer, and we delivered a solid quarter in fourth quarter. We have a strong leadership team and a committed Vonage set of team members that want to create a better Vonage going forward. We're excited to tackle 2021 and beyond. And we look forward to sharing more information with you at our Analyst Day on March 5. I want to thank everyone for joining and the entire team that answered questions today. We appreciate it. Everyone, have a great day. Stay safe and stay strong. Thank you, everyone.
Operator
Thank you for your participation. This does conclude today's teleconference. You may disconnect your lines at this time. Have a great day.