Hi, my company is proposing an Asterisk solution to a client and they plan on having five PSTN lines (three regular phone calls, one fax, one alarm). They need to have one of these lines available as a dedicated connection to the alarm company.
1. I can save the company some money if I buy just one TDM400P card with 4 FXS modules and let the alarm system plug directly into the PSTN system, bypassing Asterisk completely.
2. Purchase 2 TDM400P cards with 5 FXS modules, and plug the alarm line into Asterisk?
What do people recommend? My greatest concern is reliability, if there is a power outage would the alarm system (provided it’s on battery backup) be able to dial out through a downed Asterisk server? Anything else I should be aware of that I haven’t mentioned when dealing with alarm systems?