I am using callmanager 3.3 with a 2650xm router with the NM-HDA and EM-HDA-4FXO card installed. My primary number is setup on port 1/0/4 and calls are directed to the correct DN. I want to be able to have my primary number roll over to another number if the main line is busy. Is this function possible with analog FXO and Pots lines. Is there a better solution.
That service has to be provided by the Telco. You need them to setup the overline on that analog port to roll-over to the next one if busy. If you want to handle that functionality on the CME side you can order analog DID trunks that are just like a round-robin type of scenario. You would require an FXS/DID card. FXO are a one to one relationship to DN where DID is one to many. You would still need fxo for outgoing calls.