[asterisk-users] 180 Ringing with SDP

[Douglas Garstang]

We're dialing a disconnected number via Level 3's vector network, and
are receiving this. The response has SDP in it. Apparently, Level 3 is
playing early media. Asterisk doesn't seem to know what to do with SDP
in a 180 RINGING, and just plays ringing. What am I missing here? How
can Asterisk see there's SDP, early media, in the response and act
accordingly?

 

SIP/2.0 180 Ringing.

Via: SIP/2.0/UDP xxx.yyy.34.195:5060;branch=z9hG4bK591743a1;rport=5060.

From: "Test Phone 2" <sip:+19256002182 at xxx.yyy.34.195>;tag=as7e76044e.

To: <sip:+12059512018 at 4.55.16.99>;tag=gK0cc2d5ab.

Call-ID: 4d1db18c7d86e9e733f9f8b64c28c020 at xxx.yyy.34.195.

CSeq: 102 INVITE.

Contact: <sip:+12059512018 at 4.55.16.99:5060>.

Allow: INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,OPTIONS.

Content-Length:  231.

Content-Disposition: session; handling=required.

Content-Type: application/sdp.

.

v=0.

o=Sonus_UAC 22562 17424 IN IP4 4.55.16.99.

s=SIP Media Capabilities.

c=IN IP4 4.55.16.66.

t=0 0.

m=audio 6288 RTP/AVP 0 101.

a=rtpmap:0 PCMU/8000.

a=rtpmap:101 telephone-event/8000.

a=fmtp:101 0-15.

a=sendrecv.

a=maxptime:20.

 

Doug.

 

 

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