To will be parsed as null，This message is generated by mac software, telephone。

[jinsuojinsuo]

To will be parsed as null，This message is generated by mac software, telephone。

INVITE sip:999999999@59.110.40.211:9910 SIP/2.0
Via: SIP/2.0/UDP 125.34.208.105:61187;rport;branch=z9hG4bKPjfKaxrWpsvm-e7BLZRChpcNDLykxPJ4B1
Max-Forwards: 70
From: "8001" sip:8001@59.110.40.211;tag=qN-0Y9yR2bFZgG7i8OTYaOaFTKPWMMR7
To: sip:999999999@59.110.40.211
Contact: sip:8001@125.34.208.105:61187;ob
Call-ID: tQiy-MRgE4.DucuID.j3evkm-4ykUC73
CSeq: 26213 INVITE
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
Supported: replaces, 100rel, norefersub
User-Agent: Telephone 1.5.2
Content-Type: application/sdp
Content-Length: 443

v=0
o=- 3832828136 3832828136 IN IP4 125.34.208.105
s=pjmedia
b=AS:117
t=0 0
a=X-nat:0
m=audio 4002 RTP/AVP 96 9 8 0 101 102
c=IN IP4 125.34.208.105
b=TIAS:96000
a=rtcp:4003 IN IP4 125.34.208.105
a=sendrecv
a=rtpmap:96 opus/48000/2
a=fmtp:96 useinbandfec=1
a=rtpmap:9 G722/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/48000
a=fmtp:101 0-16
a=rtpmap:102 telephone-event/8000
a=fmtp:102 0-16