there are 2 features codes "display features", page 1 & 2.
Contact Closure Open code: Close code:
and
Contact Closure pulse code:
You will also have to change the COS "change COS", and enable the COS of any telephones that want to use this feature, it is called "Contact Closure Activation" in the COS, stroke it to a "y" on any COS's for telephones that need access to the feature.
So you pick if you want it to work in open/close, or pulse mode, and you dial the feature code from a telephone with a COS enabled for "Contact Closure". that's all there is to it, I believe.
Mitch
AVAYA Certified Expert