[Serusers] is that compliant?

[Olivier Taylor]

Hi all,
 
I have a problem with ringing message coming from our provider.
Associate with the message, i find a SDP.
Some UACs doesn't like that and doesn't give a ringback (Snom and
Grandstream ata 486)
 
SIP/2.0 180 Ringing..Via: SIP/2.0/UDP
192.168.2.101;rport=1039;received=81.247.182.42;branch=z9hG4bKfeb085ba0caf55
99..To: <sip:0495283361 at finalcut.be>;tag=507b8a49..From: " 
   Family Taylor" <sip:7321073 at finalcut.be>;tag=cf8413e3df61a5a5..Call-ID:
ae6f02682bb43efd at 192.168.2.101..CSeq: 4667 INVITE..Record-Route:
<sip:82.146.123.252>..Content-Type: 
    application/sdp..Content-Length: 217....v=0..o=VoipSwitch 7772 7772 IN
IP4 213.246.41.194..s=VoipSIP..i=Audio Session..c=IN IP4 213.246.41.194..t=0
0..m=audio 6772 RTP/AVP 
    18 101..a=rtpmap:18 G729/8000/1..a=rtpmap:101
telephone-event/8000..a=fmtp:101 0-15.. 
 
Is that correct and compliant?
 
Thanks,
 
Olivier
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