Hi Peter,

This is not a recommended setup. Have a look;

Q. Why do some line buttons on Cisco CallManager Attendant Console appear disabled?

A. If the corresponding lines are shared lines, they appear disabled.

From this doc;

http://www.cisco.com/en/US/products/ps7282/products_qanda_item09186a00800b0a20.shtml#qa17

The following restrictions apply to shared lines:

Do not use shared lines for Cisco CallManager Attendant Console pilot points or hunt group members. The phone that acts as the attendant console supports shared lines.

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008053226d.html#wp1100362

Hope this helps!

Rob