SIP over websockets to true SIP
sip, sip-server, webrtc, websocket
Solution
You are right, SIP over Websockets is a draft, not specification. And I do not know many SIP vendors who support this draft.
Possible solution is truly websocket-SIP gateway. For example Flashphoner Web Call Server is implemented as a gateway which works through websockets with browser and works via SIP(TCP and UDP) with SIP servers. Therefore it is compatible with any server that supports RFC3261 - standard SIP specification.
Brief signaling scheme is:
Browser - [Websockets] - Web Call Server - [SIP TCP, UDP] - any SIP Server
Brief streaming scheme:
Browser - [WebRTC = SRTP, DTLS, ICE, STUN ] - Web Call Server - [RTP UDP] - any SIP/RTP Server
Problem
I'm trying to implement a sip server for connecting to from an `HTML` sip client(made using sipml5). During my research into doing this I've come across sip over web-sockets which might be useful to me, however, I am unsure if a user agent connecting through sip over `web-sockets` to a compatible server would then be able to successfully make a call to some one using an incompatible server(i.e. calling from SIP over `web-sockets` to true SIP). I know `webrtc2sip` can be used for connecting to legacy networks but I would rather avoid using another proxy if at all possible. So, is it possible to connect to a compatible `SIP` server using `SIP` over `web-sockets` then make a call from this user agent to another that does not support `SIP` over `web-sockets` without using a `gateway`?