What ports would stop a dial tone from being heard? Or a call being received on the extension (other extensions see it as busy)
I have a KX-HDV230 SIP phone with similar settings that works, but the UT670 doesn't.
I have factory reset it and registered it remotely, and I can see packets on the router relating to Media Relay Gateway, in particular for CWMP and "Data Transmission Protocol (HTTPS) Port No, for SIP-MLT". The phone connects to the PBX the same as it did on the LAN, but there is still no dial tone.
What are these settings in WebMC? Are they important?
Voice (RTP) UDP Port No. (Server)
Voice (RTP) UDP Port No. (IP-PT / SIP-MLT)
I have UDP ports 16000-16511 forwarded to the DSP IP.
I am not totally sure that this is a router/firewall problem because the phone is behaving the same both on the same LAN as the PBX, and at a remote location.
Thanks in advance.
Also - as I mentioned before - once the phone is registered to the PBX I am unable to enable the "Embedded Web". It just tells me "Failed to save setting". I don't know if that is a permissions thing or not, but the only way I can get back on it is by de-registering the phone.