You are correct on the DSP resource configuration. Keep in mind that CFBXXX will only be used if it is assigned to a MGRL/MRG of a phone or device pool.
As far as a config, I can upload one a bit later. In the meantime I will post some of the key elements to make it work.
Necessary steps:
- Setup your PRI. Ensure it is in "multiple frame established" when doing "sh isdn status"
- Configure your incoming and outgoing pots dial-peers.
- Configure global SIP parameters under "voice service voip". At a minimum: a trusted ip address list of your CUCM to avoid issues in the future. And bind your signaling/media to an interface (whichever IP you'll point the trunk in CUCM to).
- Configure your voip dial-peers, don't forget to specify "sipv2" because by default voip dial-peers are h323. Point the session target ipv4 to your CUCMs, include multiple dial-peers pointing to different subscribers for redundancy, and increase the preference accordingly so they do not round-robin. Feel free to ask for more help on this one, it's broad and I'm not sure how much mileage you have.
- Configure your SIP trunk in CUCM, pointing to the IP address you binded your media/signaling to in the router(cube).
- Add your trunk to a RG/RL or simply point your CUCM patterns to the trunk. Your choice.
It probably would have been faster to just type a config for you but I want you to get the concept as well. I'll pull a config from a working environment so you can see what I am doing.
Thanks,
FG
