比如这样的
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) y g- E) q! y; f; [+ i) YOPTIONS sip:nm SIP/2.0
& R) r' t$ j# ]+ n$ X! T! dVia: SIP/2.0/TCP nm;branch=foo" F0 X% i5 h) ~: A& [+ `
From: <sip:nm@nm>;tag=root
! a; J) e& p* U. ?4 o( fTo: <sip:nm2@nm2>0 `( u9 E; M4 I+ \+ J) }/ h
Call-ID: 50000
) u( ~; a* ^$ m1 Z6 H1 p0 ECSeq: 42 OPTIONS* V9 Q* ~, w, ^1 }
Max-Forwards: 70' q6 A* M, P; m/ [) d2 ~
Content-Length: 0& q: {! t( x' m% T
Contact: <sip:nm@nm>" W9 C$ [9 @" V* C- G; Z5 O P
Accept: application/sdp1 @ B6 w' y4 Y, b5 d* E F
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