>> I was able to generate an INVITE without an SDP by using the
>> NUTAG_MEDIA_ENABLE(0) tag when I call nua_invite. The downside 
>> of doing that is the soa is disabled.

>> Does anyone know of a better way to start a call with no SDP?

I have the same problem. Following the NUA call mode
[http://sofia-sip.sourceforge.net/refdocs/nua/nua_call_model.html], I've also 
used the tag NUTAG_MEDIA_ENABLE(0) in nua_invite() to disable sdp, but I can't 
include SDP in the ACK. When I try to do that, an internal error occurs.

My attempt is something like this:
...
nua_ack(nh,
          TAG_IF(tpcc, NUTAG_MEDIA_ENABLE(1)),
          TAG_IF(tpcc,SOATAG_USER_SDP_STR(loc_sdp)),
          TAG_END());
...

So, is there any way to perform the Third Party Call Control mode ?

Thanks, 
Daniel.


      


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