On Sat, Oct 1, 2011 at 5:46 PM, Thomas Martin <tmemail at gmx.de> wrote:
> Hello Everybody,
>
> I am trying to implement a 3-party-conference by connecting the mediastreams as follows:
>
> void mergeCalls(int callOne, int callTwo) {
>
> ? ? ? ?// make sure that both calls are off-hold
> ? ? ? ?pjsua_call_reinvite(callOne, PJ_TRUE, NULL);
> ? ? ? ?pjsua_call_reinvite(callTwo, PJ_TRUE, NULL);
>
> ? ? ? ?// obtaining the media-slots
> ? ? ? ?pjsua_conf_port_id slotOne = pjsua_call_get_conf_port(callOne);
> ? ? ? ?pjsua_conf_port_id slotTwo = pjsua_call_get_conf_port(callTwo);
>
> ? ? ? ?// connecting everybody
> ? ? ? ?pjsua_conf_connect(0, slotOne);
> ? ? ? ?pjsua_conf_connect(slotOne, 0);
>
> ? ? ? ?pjsua_conf_connect(0, slotTwo);
> ? ? ? ?pjsua_conf_connect(slotTwo, 0);
>
> ? ? ? ?pjsua_conf_connect(slotOne, slotTwo);
> ? ? ? ?pjsua_conf_connect(slotTwo, slotOne);
> }
>
The pjsua_conf_connect() above may not be useful, depending on what
pjsua_call_reinvite() does. If the re-INVITE recreates the media
stream (and most likely it does), your conf connection will be lost,
so the pjsua_conf_connect() instructions above are useless.
Hence, you should do connect call's media in on_call_media_state()
callback instead.
Benny
> "mergeCalls()" is called, while two calls are connected and either callOne or callTwo is "holding" (as in "pjsua_call_set_hold(callID, NULL)").
>
> Even though the above code might be a bit of "overkill" (inefficient) with respect to re-inviting both calls and (re-)connecting both calls to "slot 0", this should not really be harmful.
>
> The Log states:
>
> ?12:07:34.115 ? conference.c ?Port 3 (sip:12345 at provider.com;user=phone) transmitting to port 0 (iPhone IO device)
> ?12:07:34.115 ? conference.c ?Port 0 (iPhone IO device) transmitting to port 3 (sip:12345 at provider.com;user=phone)
>
> ?12:07:37.677 ? conference.c ?Port 4 (sip:54321 at provider.com) transmitting to port 0 (iPhone IO device)
> ?12:07:37.677 ? conference.c ?Port 0 (iPhone IO device) transmitting to port 4 (sip:54321 at provider.com)
>
> ?12:07:37.736 ? conference.c ?Port 4 (sip:54321 at provider.com) transmitting to port 3 (sip:12345 at provider.com;user=phone)
> ?12:07:37.736 ? conference.c ?Port 3 (sip:12345 at provider.com;user=phone) transmitting to port 4 (sip:54321 at provider.com)
>
> However, the mediastreams do not seem to get merged:
>
> Port 0 can listen and talk to both, Port 3 and Port 4
> but:
> Port 3 can listen and talk to Port 0 but NOT to Port 4
> Port 4 can listen and talk to Port 0 but NOT to Port 3
>
> (Port 3 seems to be able to hear Port 4 for a fraction of a second)
>
> Somewhere, I had read about complications regarding re-pjsua_call_set_hold() and pjsua_call_reinvite() but I can't find the reference anymore.
>
> Any hints are greatly appreciated!
>
> Thank you very much in advance.
>
> Best Regards,
>
> Thomas
>
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