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OPTIONS sip:t.watson@example.org SIP/2.0
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Via: SIP/2.0/UDP c.example.com:5060;branch=z9hG4bKkdjuw
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From: Bell, Alexander <sip:a.g.bell@example.com>;tag=43
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To: Watson, Thomas <sip:t.watson@example.org>
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Call-ID: baddn.31415@c.example.com
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Accept: application/sdp