Ericsson-IPECS and BCM

Dear expects, i am trying to route calls from Ericsson-LG IPECS UCP to SAP BCM using H323. Calls are getting into the BCM Ivr but they drop off when the SAP BCM Agent answers.

If we change to SIP no calls are getting through at all, what configuration should be done in the BCM since thr PBX is just pushing calls into the IVR and the BCM takes the call control?