Yesterday Comcast came in to replace a failing SMC box with a Cisco DPC3941b. Our 8x8 VoIP phones have been working well for about 5 years with the SMC...now they do not. Internet is OK.
Over most of the past 24 hours have been searching and reading various forums like this one and see no solutions. Spent over an hour with 8x8 support, and ran their network analysis tool which came back with all green checkmarks for about a dozen aspects of required connectivity. We rebooted the Polycom IP335 phones this morning and the all still come back with "URL call is disabled".
I see no QoS settings, and research indicates that SIP-ALG is supposedly disabled by default on these boxes, even though there's no indication for this feature. SIP-ALG definitely needs to be disabled. I've opened port 5060 in the Port Triggering section.
Often came across the suggestion to have this box put into bridge mode and buy another router for the LAN, but unfortunately I'm away for 2 weeks and have been doing all I can remotely via one of the PC's.
There are 7 people without office phones they desperately need (plus no fax now).
ANY help is welcome, as long as it does not involve bridge-mode configuration.
-CJH