2015-05-28 12:46:43 -05:00

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OPTIONS sip:user@company.com SIP/2.0
To: sip:user@company.com
From: "caller" <sip:caller@example.com>
Call-ID: 1234abcd@10.0.0.1
CSeq: 2 OPTIONS
Via: SIP/2.0/UDP 135.180.130.133