SIP/2.0 200 OK
Via: SIP/2.0/UDP xx.xx.xx.xx:5060;branch=z9hG4bK2fc599c0;rport
To: <sip:33670623762@xx.xx.xx.xx>;tag=3407138099-768088
From: "2227654901" <sip:2227654901@xx.xx.xx.xx>;tag=as4cba42ba
Call-ID: 5e45753f0a7002f7214585496d6971d8@xx.xx.xx.xx
CSeq: 102 INVITE
Allow: INVITE, BYE, OPTIONS, CANCEL, ACK, REGISTER, NOTIFY, INFO, PRACK, UPDATE
Contact: <sip:33670623762@xx.xx.xx.xx:5060>
Call-Info: <sip:xx.xx.xx.xx>;method="NOTIFY;Event=telephone-event;Duration=1000"
Content-Type: application/sdp
Content-Length: 187

v=0
o=msx-mitry-1 1320385312 1 IN IP4 xx.xx.xx.xx
s=sip call
c=IN IP4 xx.xx.xx.xx
t=0 0
m=audio 14920 RTP/AVP 8 96
a=ptime:20
a=fmtp:96 0-15
a=rtpmap:96 telephone-event/8000