For an alarm line, I would not use a DID line. If there is ever a problem with the PBX, you have lost your alarm protection. Do you have a loop start line from yor DT provider. If so, that what I would use on the RJ-31x.
Look at $$$$. What are the costs for service, Add-Ons, Moves.
Emergency calls? Look at features that YOU want. Not ones that want to provide. Do they provide a Maintenance Agreement? If so how much and renewal policy and for how long?
The reliability of systems today is great, it is the...
What are looking to spend. If you have $$$$ look at Nortel, Avaya, ESI. System depends on YOUR requirements for a system, not what everybody wants to sell you. Look at all with features that help you.
Don't forget, when you are using a OPX you are using the extension of the OPX to "Power" the circuit. When you remove it and connect you must have something to power it. One or the other modems. Plain and simple.
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