SIP/2.0 405 Method Not Allowed Via: SIP/2.0/UDP nm;received=224.254.211.11;branch=foo;rport=26810 From: <sip:nm@nm>;tag=root To: <sip:nm2@nm2>;tag=aprqngfrt-c8fdbh00000k2 Call-ID: 50000 CSeq: 42 OPTIONS Allow: INVITE,ACK,BYE,REGISTER,CANCEL,PRACK,INFO,SUBSCRIBE,NOTIFY,REFER,UPDATE
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