I had a strange phone extension that after lifting the handset, pressing 0 to the get the outside line and dialing the 2nd digit a message on the screen would appear ‘ACCESS DENY’.

It turns out it was a COS issue.

To fix it:

• Lift the handset and then press ‘TRANS/PGM’
• Then select option ‘[2] COS / SMS SERVICE’
• Then select option ‘[2] COS RESTORE’
• I had ‘ENTER CURRENT PASSWORD’ appear on the screen. How to find that is listed below
• Enter the password for the station and press the ‘HOLD / SAVE’ button.
• ‘PROGAM’ Appears on the screen, hang up

To piss off the next person:

• Lift the handset and then press ‘TRANS/PGM’
• Then select option ‘[2] COS / SMS SERVICE’
• Then select option ‘[1] COS DOWN’
• ‘PROGAM’ Appears on the screen, hang up

How to find out the station password:

In LDK PCADMIN, the ‘Authorization Code Table (PGM227)’ seems to hold all the station passwords. It has 4 columns, Index, Value (this is the password), Day COS, Night COS.
The Index number, appears to line up with the Port number found in the Numbering Plan (PGM104-109).
By comparing the Station number and it’s port number in the Numbering Plan, and using that port number to match up with the index number in Authorization Code Table, I was able to work out the password (sounds complex, but easier when you attempt it).

This system was running the ‘Hotel’ software for the LG-Nortel LDK-300, I would assume that it would be the same in the LDK-130 (if it has a hotel software). I don’t think that the COS features are part of the standard non ‘Hotel’ software. I’m not sure.