I did this once a long time ago on a DS System, and think I have everything correct but it's not working on a DSX.

I have DAT set with a 7 UTRF to #201P
Speed dial Bin #201 Line Group 90 to call XXX-XXX-XXXX
Tandem Trunking allowed on all lines
CoS 2 to allowed Off-Premise and Internal Call Forward, and Unsupervised Conference
All lines have CoS 2

When I call in and Press 7 from the AA, the call goes on hold, but the system never grabs another line to make the second call, and doesn't error out either.

What am I missing?

Mike