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Snom phones just accept by default calls which are send from the same IP as configured as Outbound proxy or Registrar in the identities. Calls and messages from other IPs are rejected with "403 Use Proxy". The Phone Log will also print an error similar to this when a SIP request from a not-trusted address:
Apr 10 21:47:32.138 [DEBUG1] SIP: recv INVITE (1: 1-5324@10.110.12.106) <- Udp:10.110.12.106:5060 <----------this message is displayed only with log level DEBUG1 Apr 10 21:47:32.140 [ERROR ] SIP: reject Request, not trusted address (0, Udp:10.110.12.106 )
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