Alarm on House phone

[magnus]

I have a 6.2 Mitel system running in our office.
We wanted to save a few dollars and port a land line to our SIP provider.

I have a SL extension setup as a house phone to dial 8.
I wired the SL port to the alarm feed wire. Then connected the Out of the alarm to the Fax machine.

The fax picks up and dials normally.

I was told this week that the contact center has not received any communication from our alarm system for a while. Possibly since this was done (about a year ago) or since our network provider switched us to a 150 MB service about 6 months ago.

Has anyone done this before and had it work properly?

[acejavelin]

This usually fails... most alarm panels use dial-up data (think: analog modem) to communicate to the alarm center, and that fails on SIP to Analog connections in almost every case, faxes are treated differently by your SIP provider and could work perfectly where even a 300 baud modem will fail miserably.

If it communicates with DTMF it should work, but otherwise it will likely fail. I don't know about where you live but in most areas of the USA alarm panels must be on purely analog CO lines or use some other approved method like a cellular link by code.

[DND ON]

Alarm systems should never route through a phone system as an analog station, even if using POTS lines.

A properly wired RJ31X is the accepted standard.

[magnus]

Any thought on using a SIP ATA?
Would it convert the data better/worse?

[Tech Electronics]

Magnus,

The SIP Standard in general does not support modem CNG tones. The best thing to try, and possible won't work, is setting everything to G.711 Mu-Law in the US. If that doesn't work then you will need to get a POTS [Plain Old Telephone Service] line installed for the alarm or change it over to IP GSM if it is supported by your manufacturer and vendor.

Thanks,

TE