LD 21
PRT
SRDT
You will find if any set is in relocating mode.
If so, reallocated it by inserting THAT phone (i mean that hardware) in a non programme XDLC port.
If you don't have that phone on hand, i don't remember if any command exist to kill it. If someone knows, please post it.
If there is no print in LD 21, that's a corruption and you need Nortel assistance to kill it.