比如这样的. J- b2 T# [# f- X7 }/ ]0 [/ t
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* f, A' U: @8 O1 n" e- a' b' BOPTIONS sip:nm SIP/2.0
& n& W+ |, v6 b1 v& T5 ]) Z8 ~Via: SIP/2.0/TCP nm;branch=foo
1 ^! p5 S3 K3 T4 J' _From: <sip:nm@nm>;tag=root
2 N5 d3 J- {- j, s. r# w# L1 v FTo: <sip:nm2@nm2>8 ~4 D! s& J6 ]7 x! c. D
Call-ID: 50000
& g: ]% |& i) x; J& q. {; sCSeq: 42 OPTIONS
' l$ y5 k! Q$ \4 DMax-Forwards: 70. e; ?# V- ?( Z4 c2 u0 ` F; S9 M
Content-Length: 0
0 `: |5 ^* q! s5 ~7 e+ LContact: <sip:nm@nm>
) S: Z9 y+ L: x8 w' d; U$ J$ O5 cAccept: application/sdp
v! T% D; a1 X# d2 T8 n& k1 t- {9 T5 I" J1 i/ H1 U. `/ `- ?
- q( X) |4 N4 T4 O' H( A" p: D
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