Hello,
This topic has been covered many times on the Kamailio/SIP Router lists and the answers you require can be found by searching the lists.
I will briefly recap:
- SIP signalling and media are totally separate things
- SIP over WebSockets will allow an HTML5 based client to exchange signalling information with standard soft-phones and hard-phones. However, this does not mean that the media will interwork
- HTML5 media streaming uses WebRTC. WebRTC mandates the use of the RTP/SAVPF media profile which is not yet supported by many soft-phones, hard-phones, or media servers
This means that, provided you have configured Kamailio and sipml5 correctly, you can get the signalling part of a call working but you will almost certainly have media issues. Kamailio is a SIP signalling device, not a media device, so fixing these media issues is outside of the scope of Kamailio.
You do have a few of options with regards to the media but they are limited at the moment.
- You can try and find a phone/client that supports RTP/SAVPF (the only ones I know of are the Doubango clients and they sometimes have other issues).
- You can use a media server to convert from RTP/SAVPF (Asterisk supports this in theory, but does have issues - I believe there are fixes in the latest Asterisk trunk if you want to compile it yourself - and there may be some non-open-source media servers available).
- You can use an RTP Proxy to convert from RTP/SAVPF (erlrtpproxy has this feature on the roadmap, but I don't know whether it is available yet).
As for IE support, your guess is as good as mine. Microsoft has its own agenda and has recently been pushing the competing CU-Web-RTC specification. I have a personal opinion about how things will eventually evolve but no facts to share here - I don't believe anyone outside of Microsoft could tell you what will actually happen with IE.
Regards,
Peter
On Mon, 2013-01-28 at 20:45 +0200, Pirjo Ahvenainen wrote:
Greetings gurus!
I'm playing with an idea to create a web based softphone (html5 + no
installations for the end user) and use Kamailio's websocket module
for backend. I'd love to hear about your comments, challenges and
successes using such configuration. Is it a feasible way to construct
a softphone even today when even IE9 does not support websockets, as
such? I'm sure IE9 will end up in specs as a must-support platform.
A collegue tried using sipml5 with webrtc against a SnomONE pbx (I
know... ;)), and said there's no way it can work, but I'm not
convinced the idea itself wouldn't work.
It would help me lots if I could make a simple example using Kamailio
with SIP over websockets, can you comment on how much effort do I need
on Kamailio side to make this work? Do I need off-default config
scripting, or is it enough to just set up the module and set the
parameters? And even with the risk of stepping a little off topic, if
anyone has worked on web based softphones, I'd love to hear if you can
recommend on how to approach this.
Cheers,
Pirjo
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Peter Dunkley
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