Via: SIP/2.0/UDP <From-Address>:<Local-Port>;branch=z9hG4bK00001508
From: 1508 <sip:<From>>;tag=1508
To: Receiver <sip:<To>>
Call-ID:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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