[Spce-user] NGCP as Web2SIP gateway

[Andreas Granig]

Hi,

The issues you lined out are actually addressed in the upcoming 3.0 
release, where websocket is part of the system, the lb routing is 
adapted accordingly, and usr/dom-preferences are available to control 
SAVPF profile handling, so you can do calls within jssip apps as well as 
calls from jssip to plain SIP and vice versa (at least with audio for now).

Andreas

On 07/11/2013 01:25 PM, Alexey Rybalko wrote:
> Hi!
>
> Present implementation of WebRTC is a headache if someone making the
> bridge to a legacy SIP cloud. SRTP, SDP media-profiles...you know. Since
> the version 2.3.0 of your ngcp-medaproxy-ng Sipwise feeds our hope to
> get a relief completing that mission of service convergence :) Playing a
> couple of days with SPCE with no valuable success. More questions appear.
>
> The setup is:
>
> 1) sip:provider CE,
> 2) JsSIP as ref. implementation of SIP/WS-client
> 3) OverSIP as SIP proxy for websocket clients (SPCE comes without
> websocket.so, but some reconfiguration is required either if this module
> presents)
> 4) softphone (like X-Lite or Jitsi)
>
> The first problem was that Kamailio registrar can't save "Path" header
> from JsSIP REGISTER request. Extending DB field "kamilio.location.path"
> from 128 to 255 characters made that work :) Not sure this is a proper
> trick but it works: JsSIP cant register and send INVITE to a "legacy"
> softphone. But that's all. The  problems are:
>
> 1) SPCE (Kamailio) can't locate JsSIP to forward INVITE from softphone.
> "Path" header support is enabled however. TCPdump shows us round-robin
> traffic from 127.0.0.1 to 127.0.0.1. Softphone receives 408 (Request
> timeout) from registrar. Should we use websocket.so instead of external
> "websocket-able" SIP-proxy? What might be wrong here?
>
> 2) JsSIP drops outbound call (to softphone) on negotiation phase with
> 488 (Not Acceptable Here). No doubt that's because of unsupported
> SDES-SRTP and RTP/SAVPF on remote endpoint. ngcp-mediaproxy is intended
> to solve this issue:
>
> /"..the*complete SDP body* is passed to mediaproxy-ng, rewritten and
> passed back to Kamailio. *Several additional features are available with
> this protocol, such as ICE handling, SRTP bridging*, etc."
> /
>
> Sounds good. However help is needed to move further. Any input would be
> appreciated.
>
>
> p.s. Is there some manual about packet processing inside mediaproxy-ng?
>
> regards,
> Alexey
>
>
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