Lockout just means that the system has seen the extension off hook without activity for a long time. The problem could be anywhere from the phone all the way back to the backplane of the PBX. The system locks the port so that system resources aren't wasted and give you an alarm (if programmed} to alert you to check out the problem.

Go to the guest room and unplug the phone (both phones if you have two in the room) and see if the extension clears the lock condition. If so, you have a phone or line cord problem. If not, the room jack(s) could be shorting the line. If you're comfortable with that process, find yourself a local Mitel tech (see Installer link above) to help you out.

Anything beyond the jack should be handled by a tech who is on-site to troubleshoot the problem. Trying to take it on without experience with the system can create more problems than it solves.

Good luck,

Harry at Telecom Equipment & Consulting
Specializing in Mitel systems for the Hotel/Motel industry
www.TECHarry.com