We have a site with a full channelized T1 PRI - all channels in one group. The site does not seem to have a high number of calls going through but they complain that people calling are saying they are getting busy signals. I've watched the circuit during busy call times and noticed that the channel selection seems to be fairly random.
In CUCM - the channel selection is set to top-down, as the service provider has told me they use bottom-up.
Is there a way to see historical channel usage, or to track over time which channels are being selected for calls?