[Freeswitch-users] Re ceiving only RTP packets

[Michael Collins]

Did you ever resolve this? If not, get a debug console log and put it up on
pastebin and then put the pb url here in this thread.
-MC

On Fri, Apr 27, 2012 at 4:44 AM, rajprithiv89 <
rajkumar.kanniappan at sasken.com> wrote:

>
> Hi,
>
> we are using csipsimple android voip application which uses Freeswitch as
> SIP/Media server.
>
> We established voip calls between two android clients(A, B) by enabling
> SRTP
> in both the sides.
>
> Now the problem observed here is, when we captured the packet flow in
> wireshark, the client which initiates the call(A) is sending SRTP packets
> and the client which receives the call sends only RTP packets and the
> FreeSwitch sends SRTP packets to both the clients.
>
> We have tested FreeSwitch with other application, there also we ended up in
> the same problem(one sided SRTP packets flow).
> Also we have tested the same CSipSimple application with Asterisk server.
> It
> works fine by sending SRTP packets from both the clients.
>
>
> When i captured the Wireshark packets SDP contains:
>
>
> >From A to Server:
>
> m= audio 4006 RTP/SAVP 98 97 99
>
>
>
> >From Server to B
>
> m = audio 31562 RTP/SAVP 3 98 99 9
> m = audio 31562 RTP/AVP 3 98 99 9
> (sends two media line, one for SRTP and one for RTP)
>
>
>
> >From B to Server(Negotiation done)
>
> m = audio 4014 RTP/SAVP 3 96
> m = audio 0 RTP/AVP 3 98 99 9   (This is to inform, B is not going to use
> RTP by putting the port number as 0)
>
>
> >From Server to A(Negotiation done)
>
> m = audio 32338 RTP/SAVP 3 96
>
>
>
> But in the end,
> A is sending SRTP packets
> Server is sending SRTP packets
> B is sending only RTP packets (But in the negotiation RTP/AVP port was 0)
>
>
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