invite.sendmsg

SIP（Session Initiation Protocol）是由IETF定义

---- start ----
INVITE sip:6500@192.168.5.3:5065;user=phone SIP/2.0
Via: SIP/2.0/UDP 192.168.5.3:5064
From: 6400<sip:6400@192.168.5.3:5064>
To: 6500<sip:6500@192.168.5.3:5065;user=phone>
Call-ID: 247515495@192.168.5.3
CSeq: 1 INVITE
Subject: VovidaINVITE
Contact: <sip:6400@192.168.5.3:5064>
Content-Length: 160

v=0
o=- 99513809 99513809 IN IP4 192.168.5.3
s=VOVIDA Session
c=IN IP4 192.168.5.3
t=962892393 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=ptime:20
---- end ----