🧠 How to Integrate WebRTC with Asterisk Using a SIP Proxy
As WebRTC continues to gain traction in modern voice platforms, many businesses are looking to extend their existing Asterisk-based PBX systems with browser-based calling. The challenge? Making the two technologies speak fluently. The answer lies in a SIP proxy that bridges Asterisk and WebRTC — securely and reliably.
Why Asterisk Alone Isn’t Enough
While Asterisk is a powerful PBX platform, it was not originally built with WebRTC in mind. That means developers need to navigate challenges like:
- SIP over TLS and SRTP for encryption
- ICE/STUN/TURN for NAT traversal
- Complex SDP negotiation for media compatibility
These complexities can slow down deployment — or worse, lead to poor call quality or security flaws.
The Role of a SIP Proxy
A SIP proxy like the one used in Siperb’s WebRTC softphone acts as an intelligent intermediary between the browser client and your Asterisk server. It manages encryption, protocol conversion, and media path optimisation — so you don’t have to.
With a well-configured proxy in place, your users can make and receive SIP calls directly from the browser, with encrypted media, using only a headset and a URL.
Step-by-Step Integration Overview
- Enable WebRTC modules in Asterisk:
res_http_websocket,chan_siporpjsip, and codecs like OPUS. - Deploy a SIP proxy that supports WebSockets and SRTP.
- Configure ICE servers (STUN/TURN) for network traversal.
- Register browser clients using the proxy as a relay to Asterisk.
- Test and fine-tune SDP and codec preferences.
For a complete solution, Siperb offers hosted SIP proxy functionality, multi-device registration modes, and WebRTC clients that integrate directly with Asterisk and FreeSWITCH.
Benefits of This Setup
- Encrypted calling without complex firewall rules
- Rapid deployment for remote agents or browser-based support desks
- Scalable architecture suitable for hosted or on-prem PBX
Ready to modernise your Asterisk deployment? A browser-based softphone could be your fastest path to mobile-ready, secure voice services.
We’d love your questions or comments on today’s topic!
For more articles like this one, click here.
Thought for the day:
“That inner voice has both gentleness and clarity. So to get to authenticity, you really keep going down to the bone, to the honesty, and the inevitability of something.” Meredith Monk
