INVITE sip:1086@152.66.244.39 SIP/2.0
From: <sip:pityu@152.66.244.10>
To: <sip:1086@152.66.244.39>
Via: SIP/2.0/UDP 152.66.244.10
Contact: <sip:pityu@152.66.244.10>
Call-ID: 1111@152.66.244.10
CSeq: 1 INVITE
Content-Type: application/sdp
Content-Length: 117
Max-Forwards: 70
User-Agent: EXAMPLE User Agent 1.0

v=0
o=- 4 0 IN IP4 152.66.244.10
s=-
t=0 0
c=IN IP4 152.66.244.10
m=audio 8500 RTP/AVP 3
a=rtpmap:3 GSM/8000