See table 6 for CUPC compatibility with CUPS, where CUPC 7.1 appears to be compatible with CUPS until version 8.5.
CUCM compatibility states the following:
http://www.cisco.com/en/US/docs/voice_ip_comm/cups/8_0/english/compatibility/cupcompatibility8x.html
Be aware that Cisco UPC is compatible with Cisco Unified Communications Manager and a concurrent version of Cisco Unified Presence. Refer to this matrix’s section on Cisco Unified Presence to research Cisco Unified Presence compatibility with Cisco Unified Communications Manager.
So, same version of CUPS and CUCM, where anything until/including version 8.5 should be good.
HTH,
Chris
