version of Asterisk PBX 1.6.0.3
Log form Wireshark
(From "Asterisk" To "Mediation Server")
Session Initiation Protocol
Request-Line: OPTIONS sip:192.168.22.37 SIP/2.0
Method: OPTIONS
... ... ...
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
(From "Mediation Server" To "Asterisk")
Status-Line: SIP/2.0 405 Method Not Allowed
Status-Code: 405
[Resent Packet: False]
... ... ...
ALLOW: NOTIFY
ALLOW: BeNotify