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

[Petr Kuba]

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/

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   Petr Kuba, Project Manager
   OptimSys, s.r.o
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