I have an existing 3745 with 1 PRI connection (23b+d) into a NM-HDV2-T1/E1 card. We are in the process of purchasing a 2821 router with a VWIC2-1MFT-T1/E1. I am not planning on moving all the DSPs to one machine. The 2821 will also have a dual port fxo card for failover 911 calls.
I understand the basics of getting a single PRI line up and running and configuring the CCM to use it as the gateway. What I am looking for is a little direction on what else needs to be taken into account to ensure that both lines will be used. I understand that if they were on the same router then load balancing could happen and maybe a few other things. Is it still possible when using seperate routers? What let's the two routers inform each other or the CCM of failure or no lines left. The new line is supposed to be configured from AT&T as a 24d with 1 line able to act as the backup d when failover is needed. Are the controls for that to happen on AT&Ts side or is it something I need to configure.
MGCP is being used. I understand that CCM can utilize multiple gateways but I am looking for some insight on how call failover would work also we will be using 1 D channel for both PRIs if possible.
As always thank you in advance and I will rate helpful posts.