I am looking for a some feedback to see if this is a feasible solution. With CUCM 6.0 I want to set up 2 2811 routers as the gateways, and have 1 PRI terminated in 1 2811 (30 channels) and 1 PRI terminated in the other 2811 gateway (15 channels). Is this kind of setup feasible, ideally Id like CUCM to recognise when the 30 channels on the main 2811 are in use, and then use the additional 15 channels on the secondary 2811 when they are needed.
Im pretty new to voice, so am not fully aware of the capabilities for splitting the PRI's between 2 gateways.
You are most correct my friend, when all the channels on the first PRI are busy then the second PRI will be selected for use :) Look under Call Routing Configuration in this rather large CCM 6.x pdf;
Work with the Telco to make sure what order the calls are coming in on and you can maximize the use of both PRI's. For example, if you Incoming calls are starting on the 30 Channel PRI - Channel 1 you might want to start your Outgoing calls on the 15 Channel PRI - Channel 15. It's pretty flexible. So for our 4 PRI's the flow might be;
2811 # 1 - PRI 1&2
2811 # 2 - PRI 3&4
Incoming calls cycle through 1,2,3 and 4
Outgoing calls cycle through 4,3,2 and 1
Hope this helps!