This usually only happens if the phone is not able to register, but it might freeze your router. If you have trouble to get this to work, try this debug commands:ĭebug ccsip all (Be carefull, some phones fire off over 20 register requests per second. ISDN configuration is for German PSTN, but you should be able to modify it for your needs. Registration would then work too & everything should be fine (except for the additional delays. Signalling & RTP communication is NOT encrypted in this example! Be aware of that! You could tunnel this traffic through a VPN. Keep in mind that, as always, public IP's have been changed to private ones. The SIP phones need to reach each other, their voicemail and PSTN phones via ISDN breakout. Had to configure a Cisco Callmanager Express to accept connections from 3rd party SIP phones via the Internet.
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