Re: Third Party VoIP Over Xfinity

On 9/12/24 9:08 AM, Brandon Svec via NANOG wrote:

What kinds of third party SIP are you all having so much issue with?  I manage a lot of accounts using the big, hosted providers and plenty of the endpoints sit behind Xfinity/Comcast boxes without issue.

The dropping registrations just sound like timer and firewall configurations.  By rule, I try to always go bridged mode with Comcast provided boxes, but even when not I can't recall having an issue like this except via the normal things like ALG being enabled or some type of security inspections causing trouble.  And TLS is the way 100%

Is it possible it's being run over UDP? Is UDP even practical with SIP these days given bloat? Mike