比如这样的2 K( L6 {* u6 }+ z& Z, `
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OPTIONS sip:nm SIP/2.0
9 C9 f4 m" o& E; ^; `: _, i1 UVia: SIP/2.0/TCP nm;branch=foo
9 I l A$ X$ u2 U! _' _ UFrom: <sip:nm@nm>;tag=root
) m1 c3 o: m; I9 [+ t8 y" XTo: <sip:nm2@nm2>" Z( l: x5 Q! Y/ N& G6 Z4 q: l: T
Call-ID: 50000
7 [9 f! @; f8 PCSeq: 42 OPTIONS' {3 h* Y1 i- Z' T/ v' }
Max-Forwards: 702 e" K& V* E) K- T: e. L+ j" N# w
Content-Length: 0# v4 e, Z; E: p" R% |9 s( ]
Contact: <sip:nm@nm> K4 b8 @' R3 W0 r9 k: ~' Z. C
Accept: application/sdp
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