Enable the DISA Conf function, cause that is what it actually is and set the timer which controls the call, it is defaulted at 10 seconds. Flash 51 button 24 button 3.
Timer is flash 01 button 9. Then again this may already be set or dial 9 would not work. However if the manual is precise, DISA has access to line groups not individual lines unless it is a group of one.

DISA callers may access LCR, All Internal/External Paging, All Call
Paging, Call Park Pick-Up, and Meet-Me Paging. A DTMF receiver must be available for DISA
operation. The duration of a trunk-to-trunk DISA call can be set by system administrator.
Incoming DISA callers may access all line groups such as FX or WATS lines or other outgoing
services while away from the office.

Question, how did your customer forward their calls? CO or STS, because if it were the STS you should be able to change it thru DISA, I seem to remember doing that using the call forward follow me code along with * for off-net to speed dial number.

Seems I still have to keep my finger in it after how many years?

Last edited by Derrick; 01/20/20 11:01 AM.

www.myrandomviews
"Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about"

Retired, taking photographs and hoping to fly one of my many kites.