Yes.
Follow this document for CallManager 3.2:
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_configuration_example09186a0080169445.shtml
Follow this document for CallManager 4.0:
http://www.cisco.com/en/US/tech/tk652/tk701/technologies_configuration_example09186a0080210cfe.shtml
The configuration of the Gatekeeper is the same regardless of the version of CallManager.
The config will be something as such:
Gatekeeper
zone local Gatekeeper cisco.com
zone subnet CCMv32 cisco.com
zone subnet CCMv32 cisco.com 0.0.0.0/0 enable
zone subnet CCMv40 cisco.com
zone subnet CCMv40 cisco.com 0.0.0.0/0 enable
zone prefix CCMv32 408* (when GK receives 408 it will forward to CCMv32)
zone prefix CCMv40 972* (when GK receives 972 it will forward to CCMv40)
gw-type-prefix 1#* default-technology (only place 1# in the CCM configs)
no shut
Dan