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运营商要求：
INVITE sip:500000@sbc.com SIP/2.0
Via: SIP/2.0/UDP 10.43.xx.xxx:8000;branch=z9hG4bK18534-31328computer70000000
From: "500000"<sip:500000@sbc.com>;tag=Onetest2.0F-1112828683
To: "50000333"<sip:50000333@sbc.com>
P-Preferred-Identity: "500000"<sip:500000@sbc.com>
Contact: <sip:500000@10.43.xx.xxx:8000>
CSeq: 1 INVITE
Supported: from-change,100rel
History-Info: <sip:500000@sbc.com>;index=1
History-Info: <sip:50000333@sbc.com>;index=1.1
Call-ID: Onetest2.0caller500000-called50000333-3010427616
Allow: INVITE, ACK, CANCEL, BYE, PRACK, UPDATE, REFER, MESSAGE
Max-Forwards: 70
Content-Type: application/sdp
Content-Length: 226
v=0
o=- 1344717233 671620191 IN IP4 10.43.xx.xxx
s=-
c=IN IP4 10.43.90.149
t=0 0
m=video 8001 RTP/AVP 98 99
b=AS:75
a=rtpmap:98 H263/8000
a=fmtp:98 profile-level-id=0
a=rtpmap:99 MP4V-ES/8000
m=audio 8000 RTP/AVP 8
FreeSWITCH版本： 1.4.26
呼出送: {sip_h_X_History-Info=sip:3333333@xxx.xxx.xx.xx;index=1} 即可