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REGISTER sip:company.com SIP/2.0
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To: sip:user@company.com
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From: sip:user@company.com
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Contact: sip:user@host.company.com
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Call-ID: k345asrl3fdbv@10.0.0.1
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CSeq: 1 REGISTER
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Via: SIP/2.0/UDP 135.180.130.133
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Contact: sip:user@example.com?Route=%3Csip:sip.example.com%3E
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