The partner needs to have a Remote Access Card installed for you to "dial" into it. You can also connect locally by plugging your modem in your laptop to a station port. Also you will need the avaya PC Administration software to interface with the system. Here is the link where you can download:
https://support.avaya.com/japple/css...ucketID=108025
You have to set the partner with a password, it does not use the same format as the Definity line.
Hope this helps...