Have you tried placing the CPE in “bridged" mode? It’s been a while since I’ve done anything with Comcast CPE, but I remember their CPE doing SIP ALG when acting as a router.
> On Sep 10, 2024, at 2:17 PM, Matt Hoppes <mattli...@rivervalleyinternet.net> > wrote: > > I have an employee who has recently switched to Xfinity cable service. Ever > since they switched their internet service their work phones will not stay > registered for more than about 3 minutes. > > These same phones have been used on many ISPs without issues. The same > config has been used behind multiple levels of NAT without issues. > > She was fine, until she switched to XFinity. > > Of course, XFinity support is absolutely worthless. > > Anyone from XFinity Tier 3 or such that might be able to offer assistance? > > I suspect it's something stupid with either NAT overload in the modem or the > modem not keeping the SIP channels open. > > I've tried playing around with registration times without any success. And > again, we've never had issues with these phones or this setup with any other > ISP. > >
