Hu Chunming / sip_server

sip80 229 Bytes
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OPTIONS sip:135.180.130.133 SIP/2.0
Via: SIP/2.0/UDP company.com:5604
From: sip:iuser@company.com
To: sip:user@135.180.130.133
Call-ID: 1804928587@company.com
CSeq: 1 OPTIONS
Expires: 3600
Contact: sip:host.company.com