Exchange 2013 UM and Avaya Session Manager 6.2 integration- SIP dial plan only supported

I have read through the config notes listed on the MS website.  They specify a telephone extension dial plan.  The problem is that Exchange 2013 UM won't use that kind of a dial plan.  It only uses a SIP URI dial plan.  I tried creating a telephone extension dial plan and it errors upon save.

Anyone have this working and if so, how? details please?

Thanks.