T48G - Sennheiser SD Pro2ML - EHS36 - no microphone function

[davehorn]

I have a new T48G, a new Sennheiser SD Pro2 ML, and a new EHS36. The electronic handset lift function works perfectly, and I can hear the dial tone at the correct volume, but when I speak, the party on the other end can not hear me.

All of the connections are correct, according to the diagram in the EHS36.

Thank you for your assistance.