I have a Client that is a new OOMA Office customer. Their ISP is Comcast Business, with a 50/10 data circuit. They have a base station and two Yealink IP phones. They get intermittent (2-4 times per day) “No Service” messages on their IP phones. The base station appears to be unaffected. During these periods of “No Service” messages on their Yealink phones, their internet connection is ok - they are able to send and receive emails and browse the web without issue. A power cycle of the phones or a few minute wait usually means that the “no service” message will disappear. The “no service” message may appear on one or both of the phones. Most of the time it is not both phones but it can be. If they happened to be on a call when the service drops, the call drops, but web browsing is still fine.
The network is simple. IP Phones and PC’s connected to a Gigabit switch which in turn connects to the Comcast supplied Business Gateway device. DNS is Comcast but also tried Google DNS to see if that improved things. Changing the DNS did not help. Local network consists of a couple of PC’s and a couple of network printers, mostly doing word processing and email/light web browsing.
IPv6 is operational on this network (in addition to IPv4). Can IPv6 be a factor in this problem?
I’m looking for assistance in troubleshooting this issue. Any Suggestions?
FWIW, I am also am OOMA Office customer with two Yealink IP phones and a base station. I am also with Comcast on a 50/10 business data connection. I’ve never seen a “No Service” message on my phones, except when power cycled (rarely).
Thanks in advance for any help.