It looks like the main issue is that Comcast’s DNS servers – 75.75.75.75 and 75.75.75.76 – don’t always work well with iOT devices, such as Polycom IP phones. It seems that the phones were not able to use Comcast’s DNS service to translate the domain name to the proper IP address in order to work. The first time I called tech support, they told me to reboot everything, and that seemed to work.īut then it happened again, and five different reboots didn’t quite work. These phones are supposed to be able to be plugged into any network (home, office, on the road) and just work. The error message was “URL dialing not available” or “DHCP failure” or “network is down” or “Unable to register.”Īfter this happens, the Polycom IP phones have trouble rebooting and re-connecting. We’ve had a few small power outages here, and that’s killed the power to the Comcast Cable modem, as well as the switch. We also have a few cloud soft phones, as well as a Generic SIP Phone (AnyPhone). Specifically, Polycom IP331 2-line phones. We have a relatively new phone system, using Polycom IP phones. Polycom IP331 2-line phone – Not connecting to network
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