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OPTIONS sip:40.160.55.224:9999 SIP/2.0
Via: SIP/2.0/TCP 40.160.55.224:9999;branch=z9hG4bKff0e1051
Max-Forwards: 70
From: <sip:scanner@40.160.55.224>;tag=ff0e1051
To: <sip:40.160.55.224:9999>
Call-ID: ff0e1051@40.160.55.224
CSeq: 1 OPTIONS
Contact: <sip:scanner@40.160.55.224:9999>
Accept: application/sdp
Content-Length: 0