Hi,
If the CUCM is upgraded to 7.1.5, this will require an upgrade to 7.0(1) SR5 for your IVR to maintain compatibility. The 7.0(1) release of UCCX is in the current compatibility matrix, found here:
http://www.cisco.com/en/US/docs/voice_ip_comm/cust_contact/contact_center/crs/express_compatibility/matrix/crscomtx.pdf
The 7.0(1) IVR upgrade will need to be ordered, as it's not available for download. The SR5 patch is available for download on Cisco.com.
Thanks,
Brendan