I have an intercluster trunk setup between two call managers. How can I define what codec should be used on this trunk?
Use Locations and Regions for this configuration:
Locations and regions work in conjunction with one another. Regions define the codec (G.711, G.722, G.723, G.729, GSM, or wideband) that is used on the link, and locations define the amount of available bandwidth for the link. You assign each device in the system to both a region (by means of a device pool) and a location.
What version of CUCM are you using?