4557 INVITE sip:<To> SIP/2.0
Via: SIP/2.0/UDP <From-Address>:<Local-Port>;branch=z9hG4bK00003641
From: 3641 <sip:<From>>;tag=3641
To: Receiver <sip:<To>>
Call-ID: <Call-ID>@<From-Address>
CSeq: <CSeq> INVITE
Contact: 3641 <sip:<From>>
Expires: 1200
Max-Forwards: 70
Content-Type: application/sdp
Content-Length: <Content-Length>

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252 <Teardown-Method> sip:<To> SIP/2.0
Via: SIP/2.0/UDP <From-Address>:<Local-Port>;branch=z9hG4bK00003641
From: 3641 <sip:<From>>;tag=3641
To: Receiver <sip:<To>>
Call-ID: <Call-ID>@<From-Address>
CSeq: <CSeq> <Teardown-Method>
Content-Length: 0