Does anyone have something like this in place?

Beginning to learn about Avaya systems, however I'm much more familiar with FreeSWITCH and I was curious if there are any limitations that would prevent one from using FreeSWITCH as a conference server via SIP through an Avaya CM?

Referencing the thread, "SIP Trunk to Avaya CM" I can see that you could register FreeSWITCH as a trunk, and route your calls to it but I was wondering if Avaya has preventative measures in place to urge customers to purchase some other product or license.

Any help appreciated!