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INVITE sip:user@example.com?Route=%3Csip:example.com%3E SIP/2.0
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To: sip:user@example.com
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From: sip:caller@example.net;tag=341518
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Contact: <sip:caller@host39923.example.net>
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Call-ID: escruri.23940-asdfhj-aje3br-234q098w-fawerh2q-h4n5
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Via: SIP/2.0/UDP host-of-the-hour.example.com;branch=z9hG4bKkdjuw
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Content-Type: application/sdp
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o=mhandley 29739 7272939 IN IP4 192.0.2.1
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m=audio 49217 RTP/AVP 0 12
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m=video 3227 RTP/AVP 31