Just a bit of a follow up. My operations is on PRI service. My service provider offers a feature called "Trunk Busy Overflow." Like the name implies, if the one PRI trunk is busy calls will roll to another PRI we own. If I talk to the right person with the service provider I found I can have multiple PRI connections roll over to the backup site.
thanks gentlemen for your resposne !!! very helpful !!!
I am still iffy about SIP and not sure if the cost saving is really there and more than likely I will run into some sort of interop quirks as Steven mentioned in his response. I currently running with 4 PRIs (2 in Ca and 2 Tx) and disaster recovery worked great for me, all calls come in to Ca first and then overflow to Tx if Ca is busy or offline.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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