SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.0.0.2:5060;branch=z9hG4bK-6372-104-0
From: sipp <sip:sipp@10.0.0.2:5060>;tag=104
To: sut <sip:service@10.0.0.3:5060>;tag=6367SIPpTag0131
Call-ID: 104-6372@10.0.0.2
CSeq: 1 INVITE
Contact: <sip:10.0.0.3:5060;transport=UDP>
Content-Type: application/sdp
Content-Length:   127

v=0
o=user1 53655765 2353687637 IN IP4 10.0.0.3
s=-
c=IN IP4 10.0.0.3
t=0 0
m=audio 6000 RTP/AVP 0
a=rtpmap:0 PCMU/8000