Comcast voip isn't going over the internet. Theirs runs close to a good
quality landline with no jitter on their internal network. So it can handle
data from alarms.

Regular voip going over the internet is good enough for voice but not
usually good enough for data.

Our policy for phone lines is we only support voice. We don't support
anything that requires data or life safety applications like fax, alarms,
elevators, fire alarms, etc. There are efax solutions for old school fax
machines but it's not a normal voip line.



Darin Steffl
Minnesota WiFi
www.mnwifi.com
507-634-WiFi
Like us on Facebook <http://www.facebook.com/minnesotawifi>

On Thu, Sep 17, 2026, 5:25 PM Jason McKemie <
[email protected]> wrote:

> I just switched a business customer over from Comcast. They had one voice
> line and data. After the number ported their alarm stopped working. The
> alarm company is telling me that their system will work over Comcast's
> voip, but won't work over most other providers, including AT&T landlines.
>
> A couple of things here:
>
> You can have a data stream for an alarm going out a voice line that is
> actively used for it's intended purpose?
>
> This can, in some cases, be a VoIP line?
>
> They are trying to hit this account up for $1700 to switch over to a
> cellular / IP system.
>
>
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