Two things that seem to help whenever I'm dealing with bizarre Comcast issues....have her call in and: * Ask for "Security Edge" to be disabled if it's enabled (last time we did this Comcast told us they couldn't permanently disable it unless we paid a lot more per month for service and it would automatically enable every reboot, but another rep permanently disabled it for us) * Ask them to disable "Smart Packet Detection" if she's using a router that has that feature
Those two features seem to mess with a lot of traffic--specifically DNS (re-routing any unencrypted DNS request to Comcast's own servers) and SIP. Of course enabling TLS for your SIP connections would probably help significantly--not just with connectivity, but security. -A On Tue, Sep 10, 2024 at 12:20 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. > > >