A common problem on Avaya IPO Partner Version is that there are issues with getting incoming calls to ring on single line telephones.  This becomes problematic when a customer wants to use a single line cordless phone to answer calls when they are away from their desk.   In the past, we recommended that a customer use the Avaya ETR Module for Partner Phones in order to do so.  The problem with this is that if your customer does not intend to use Avaya Partner Phones, then you are using up an available cabinet slot for a single line extension.   You could not use the Avaya ATM combo card with single line extension ports, or the Avaya Phone8 or Phone2 module for single line extension port. 

We have discovered a new solution to this problem.  Avaya has addressed this issue in IP Office Release 7.0.  The IPO 7.0 now has a “PBX System” mode. This allows incoming calls on CO Lines to be sent to 1 of 4 “Ring Groups”.  If a standard single line telephone (cordless) is a member of the Ring Group, it will ring on incoming calls.

So the old rule that single line telephones won’t ring on incoming calls has been modified.
At the moment, Avaya is still issuing release 6.0 SD cards, so if you need to access this feature, you must upgrade your system to release 7.0 when purchasing.