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CUCM 8.5 SIP trunk to IP Office 500 R7.0 problem?

We have CUCM 8.5 in our lab (without Cisco Router as gateway) with few Cisco phones and our production IP PBX is IP Office 500 R7. I tried to configure SIP trunk between CUCM and IP Office using guide on https://devconnect.avaya.com/public/download/interop/CUCM8IPO7SIPtk.pdf.

Calls from Avaya IP Office to CUCM are working fine, but in other direction we got busy tone on Cisco phone. Any idea what is the problem. I tried everything without luck.

Thanks.

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