You don't mention your version so I'll post info for 8.X, if not your version, confirm it's the same by searching the same doc and section for the version you need.
Configuring Application Billing Servers
Use the following procedure to configure application billing servers to which you want to send CDRs. You can configure up to three billing servers.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/8_0_2/admin/sacdrm.html
HTH
java
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate