hi da
Maybe you can learn some information refer to below link:
http://www.avaya.fr/emea/fr/resource/assets/factsheet/lb1567.pdf Do you mean that, the Avaya ip softphone or other thing, like Jeff asked, what do you want to deploy and achieve?
Maybe your deployment not releated with OCS.
Because Avaya also has a UC integration soulation between the outlook and Avaya.
You canrefer to bleow link:
http://www.avaya.de/emea/de/resource/assets/applicationnotes/MMExpressIMAP.pdf If i misunderstand your issue, please tell me!
regards!