[asterisk-users] Disallowing unauthorized calls to Cisco & Polycom phones

[Yehavi Bourvine +972-8-9489444]

Hello,

  I would like the IP phones to not accespt SIP requests (like INVITE) from any
device other than its proxy. Snom phones ignore this while Cisco & Polycom
accepts the call. Any idea what to do to disable it?

                                                 Thanks! __Yehavi:
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