I've found this old report below
ACD sets do not remain in Not Ready when a DN key is pressed.
Problem seen on software rls 3 with M3905 and M3904 Taurus sets
An ACD agent in a Not Ready state presses the DN key to make a call and the Not Ready indicator goes out. When the call is terminated, the NRD indicator comes back on. If the NRD key is pressed during the call, the call is, of course, released.
In this case, Symposium was installed and a SCB was configured in LD23. After removing the SCB and providing an ADS block instead, the Not Ready indicator stays on when the DN key is pressed (!&!)
Note: the problem is not Symposium-related.
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M3905 set unable to get out of Not Ready
M3905 agent tele set being unable, after logging in, to take set of Not Ready. Only way to take set of not ready is by logging set out - then it wont take calls.
All the best
Firebird Scrambler
Meridian 1 / Succession and BCM / Norstar Programmer in the UK
If it's working, then leave it alone!.