Building code 'round these parts technically always allowed VoIP for an elevator phone. You just had to provision for so many hours of battery backup on any electronics the phone depended on. I always told people not to do it unless they have a plan for maintaining
and testing the battery backup. The POTS line had battery backup at the CO and it was someone else's problem.
Alarms were always hit or miss. I did learn that there are different communication protocols used for alarms, and some alarm companies could make it work on VoIP by switching protocols.
Most telcos no longer have copper pots. I wonder what the alarm and elevator companies are doing as pots is gone from almost everywhere.
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
507-634-WiFi
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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