MGCP doesn't properly support channelised E1 or T1 circuits, in that you can only specify circuits that have the full 30 or 23 channels respectively, rather than an E1 that only has 8 channels from the TELCO.
You can use the following guide from Cisco to get channelised PRI to work in CallManager, simply by creating a full T1 or E1 with the full amount of channels, and then use the guide to busy out the channels that aren't required/available from the TELCO. You can also use the same feature to disable individual channels when troubleshooting:
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_configuration_example09186a008076f8d2.shtml
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