Re: [Linphone-developers] ortp: changing remote party ip/port during one rtp session

[Simon Morlat]

Hum, what can produce is that the second stream has timestamps totally unrelated with first stream. Thus a rtp_session_resync() before receiving the second stream could help.

Le Wednesday 20 May 2009 16:46:13 Petr Kuba, vous avez écrit :
> Hello Aymeric,
>
> What do you mean by "specific control"? And where do you use the code
> below?
>
> We need to handle the following scenario in a SIP call:
>
> 1) We send INVITE to a PBX.
> 2) PBX sends RINGING with session description, PBX is our RTP remote
> address 3) PBX sends OK with session description, called SIP phone is our
> RTP remote address
>
> It means that first in (2) we start receiving RTP from PBX and then in
> (3) we need to change it and start receiving/sending from the SIP phone
> we called.
>
> In (3) we call rtp_session_set_remote_addr() but then we do not receive
> any RTP packets from rtp_session_recvm_with_ts().
>
> Of course we use the same port as in (2) but I guess that it is
> responsibility of ortp to close the socket and open it again. For
> completeness, we are running on windows.
>
> Thanks for help,
> Petr
>
> Aymeric Moizard wrote:
> > If you are looking for doing some symmetric RTP, there is an API to
> > allow symmetric RTP to be automatically handled.
> >
> > In case, you want specific control, the code below is working for me:
> > memcpy(&session->rtp.rem_addr, &evt_data->ep->addr,
> > evt_data->ep->addrlen);
> > but you have to make sure the socket is not bound to the old destination.
> >
> > tks,
> > Aymeric MOIZARD / ANTISIP
> > amsip - http://www.antisip.com
> > osip2 - http://www.osip.org
> > eXosip2 - http://savannah.nongnu.org/projects/exosip/