I have a Nortel Networks BCM 400 phone system. I'm trying to implement a complete voice backup system for my phones. I do have voice mail, but I'm not concerned about a backup for the voice mail. I have a main office where the BCM is installed and I have 5 branch offices that connect via T1 circuits. What are the options for disaster recovery in the event the main location where the BCM is located is destroyed? I've looked at pbxparachute, and telecomrecovery.com and I'm not sure that is what I'm looking for.