Device Type: desktop
Skip to Main Content Skip to Main Content

WebRTC and SIP: What's Best for My Business?

This article was updated on August 7, 2022

Multichannel communications reached buzzword status years ago, but it's never been old news thanks to the ever-expanding list of channels. Today, those channels are increasingly real-time. This trend is partly driven by need — during the COVID-19 pandemic, companies adopted on average 3.5 new communication channels, with one in three rolling out interactive voice response (IVR) and live chat for the first time. Multichannel real-time communications (RTC) has also become more popular as it's grown more accessible with the help of WebRTC technology and session initiation protocol (SIP).

Illustration of a woman sitting in front of a computer keyboard and monitor. On the monitor screen can be seen a multi-participant video conference, along with an ongoing chat conversation.


As your company's list of RTC channels continues to grow, so does your need to integrate the technology that powers them. Unless you want to invest in a robust, cloud-based unified communications platform that has already integrated everything you need, you'll need a backbone for your communications tech stack. That's where SIP and WebRTC come in. 

What is WebRTC? How does it differ from SIP? And which one (or a combination of the two) is the best fit for your business?

What Is SIP?

Let's start with the older form of technology first. SIP is a text-based signaling protocol that enables real-time communication online. The technology first emerged in the 1990s as a way for people to communicate using computers and later helped make voice over internet protocol (VoIP) technology possible. Today, SIP facilitates conversations across different types of devices and different apps. 

In its simplest form, SIP is computer code that establishes communication sessions, manages the signal throughout the conversation, and terminates the connection when your session ends. At its highest level, a SIP trunking provider gives you a multiuser, media-agnostic platform that you can use to build and integrate internal and external communications tools. Modern SIP trunking solutions play nicely with newer IP networks and legacy systems, letting you make and receive internet-based phone calls via traditional desk phones. In a nutshell, SIP trunking gives you the power to bring voice, data, and video into a single digital location.

How Does SIP Work?

SIP initiates, maintains, and terminates internet-based RTC by sending data packets between two devices, explaining who is trying to communicate with whom, what technology will be used, and what requirements the recipient's device must meet to receive the call. 

If the recipient answers the call, an SIP response message is triggered, sending back a data packet explaining their communication capabilities. If both parties send enough of the right information, a connection can be established and communication can begin.

Pros and Cons of SIP

SIP is format-agnostic, so it can facilitate any type of RTC via any internet-connected device or (with the use of SIP trunking) even legacy hard phones. Because SIP can identify different devices and link their communications capabilities, it enables multiple media types to coexist in a seamless communications channel. That's why it's commonly used in VoIP solutions, including unified communications and contact center platforms. 

SIP-based VoIP and video conferencing solutions typically cost less than traditional phone service, but it does require an investment in specialized equipment and software. It also requires a strong internet connection for true real-time interactions.

What Is WebRTC?

SIP has long been the most common mechanism for establishing RTC, but WebRTC technology has become an increasingly popular alternative.

WebRTC is an open-source protocol developed by Google that facilitates RTC between web browsers and devices. It's what lets voice and video communications work inside web pages without the use of plug-ins, and you can integrate it into applications without the need for a browser.

This technology has been around for a decade and was quickly adopted by web developers. In 2021, it was deemed a web standard by both the World Wide Web Consortium and Internet Engineering Task, and it is currently available on all popular web browsers.

How Does WebRTC Work?

WebRTC technology is a set of APIs that allow browsers to access devices, including the microphone and camera. It also lets you send various types of data, including audio and video signals, text, images, and files. 

WebRTC is an open-source platform, meaning it's free to use the technology for your own website or app. For example, you can add click-to-call functionality on your website or social media pages, enabling customers to initiate a voice or video call with you from their browser to your device.

Not only can WebRTC power communications, but it also enables other real-time data sharing possibilities, from online gaming to virtual events to internet-of-things operations.

Pros and Cons of WebRTC

Because WebRTC is already built into browsers and business applications, there's no upfront investment, no software to download, and no hardware for your IT department to manage. WebRTC is enabled in browsers; this basically provides a communication stack to any browser-enabled device. The technology is updated frequently (through browser updates), which means newer codecs and rate-control techniques can be added quicker — especially important for video, which relies on many updated feedback mechanisms that are just not supported by SIP devices.

Business apps and communications platforms that leverage WebRTC technology tend to be less expensive, more flexible and scalable, and easier to use than SIP-based solutions, making them more accessible to smaller businesses with few IT resources.

But WebRTC does have limitations. Applications that leverage it tend to use a lot of memory — which can cause problems on older, slower devices. It also doesn't play nicely with analog legacy technology.

When Should Companies Adopt Each Option (or Both)?

When WebRTC first started gaining momentum, some experts predicted it would eventually replace SIP, but markets for both solutions continue to grow. That's because each technology has advantages and disadvantages, and some companies use both in their communications tech stacks.

How do these options work for your business? That depends on your current setup and future needs. If you’ve already invested in SIP and it's meeting your needs, WebRTC-based communications might not be necessary. With the right communications platform, you'll still be able to use new and emerging communications features and integrate other business software. If you want to continue using legacy technology such as desk phones and private branch exchange (PBX) systems, you'll need SIP trunking to integrate that technology with digital channels.

If you're building your tech stack from scratch, your team only communicates through digital channels, and everyone has relatively new devices, WebRTC can handle your communication needs at a lower cost and with less complexity than SIP. WebRTC can also do things that SIP can't — for example, enable you to embed communication channels in your website or applications.

At the same time, some businesses embrace a hybrid environment, where they can leverage their existing SIP infrastructure and gradually expand their reach with WebRTC-based applications.

Next Steps

Both SIP and WebRTC can provide a backbone for RTC. You can make the argument that WebRTC is more future looking. However, with so much of the world's infrastructure built on Voice over IP and with the evolution of PSTN, SIP can still play a role as you consider your application needs and the customers you intend to reach.

Either way, you need more than a path to open the lines of communication. You also need a way to have conversations across an ever-growing list of channels — from voice and video to live chat and social media. You can piece together third-party apps and integrate them into a communications stack or invest in a robust unified communications platform that includes them all and lets you leverage SIP and/or WebRTC, depending on the needs of your business.

And whatever method you choose, Vonage does that.

To learn more about RTC and Vonage Communications APIs, contact a Vonage representative.


Contact a Vonage expert.

We'll get back to you shortly.