Sorry, but this is going to be as helpful as the last answer (not very). Get in a CUCM Express if you have the budget - just ditch the Avaya! Even replacing it with FreePBX/Astrix or anything would be easier.
Actually the config for the CUBE is easier than you think. I have done this multiple times, I have 2 SIP providers that I have this working through. One requires registration of the sip trunk the other does not. Both configs of the CUBE are similar biggest difference being the registration of the SIP trunk vs no registration requirements. Let me know if you need help with the configs for the cube and the IPO.
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