If it's integrated via a SIP trunk, it's the same as if it was CUC or any other CUCM you had with a SIP trunk.
Make a call from your IVR via the SIP trunk in a way your CUCM knows how to route it, and configure the significant digits and inbound CSS as required.
The config on your IVR, that's up to you, from the CUCM side, that would be the basic config you would start with.
HTH
java
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