[sr-dev] ICE=force_relay tests between two baresips

[Juha Heinanen]

Richard Fuchs writes:

> > if a=rtcp:<port> did not exist in incoming sdp, there is no need for
> > rtpengine to add it, because then, by default, rtcp port is one larger
> > than rtp port.
> 
> ICE mandates that the a=rtcp attribute is present, even if the RTCP port
> is the default one.

I did check ice rfc 5245 and didn't find such requirement.  Word "rtcp"
does not exist in the rfc and its ice sdp example does not include rtcp
attribute:

       v=0
       o=jdoe 2890844526 2890842807 IN IP4 10.0.1.1
       s=
       c=IN IP4 192.0.2.3
       t=0 0
       a=ice-pwd:asd88fgpdd777uzjYhagZg
       a=ice-ufrag:8hhY
       m=audio 45664 RTP/AVP 0
       b=RS:0
       b=RR:0
       a=rtpmap:0 PCMU/8000
       a=candidate:1 1 UDP 2130706431 10.0.1.1 8998 typ host
       a=candidate:2 1 UDP 1694498815 192.0.2.3 45664 typ srflx raddr 10.0.1.1 rport 8998

Where did you find the requirement?  Is it in some other rfc?

-- Juha