Re: Third Party VoIP Over Xfinity

[Mike Hammett <nanog () ics-il net>]

We've just moved to tunneling anything VoIP if on Comcast's network. 




----- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 

----- Original Message -----

From: "Matt Hoppes" <mattlists () rivervalleyinternet net> 
To: nanog () nanog org 
Sent: Tuesday, September 10, 2024 2:17:37 PM 
Subject: Third Party VoIP Over Xfinity 

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.