H3C login:
SIP/2.0 404 Not Found From: <sip:nm@nm>;tag=root To: <sip:nm2@nm2>;tag=9f2bc8-0-13c4-50029-2996f-4c507e2-2996f Call-ID: 50000 CSeq: 42 OPTIONS Via: SIP/2.0/UDP nm;received=224.98.24.192;rport=26810;branch=foo Supported: replaces,100rel,timer Accept: application/sdp Allow: INVITE,ACK,CANCEL,BYE,OPTIONS,REFER,INFO,NOTIFY,PRACK,MESSAGE Content-Length: 0
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