test/req-test1.sip
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 INVITE sip:foo@127.0.0.1:5061  SIP/2.0
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 Via: SIP/2.0/UDP 127.0.0.1
 Via: SIP/2.0/UDP 127.0.0.1:5061
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 From:  <sip:x@foo.bar>
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 To: <sip:y@bar.foo>
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 Call-ID: 9437892232b@foo.bar
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 CSeq: 143 INVITE
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 Contact:<sip:x@foo.bar>
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