My company has an Avaya phone system that uses Partner 18d phones. When you pick out the receiver the phone would go to one of our 4 outside lines, but recently on ext. 10 when you pick up the receiver it goes to the right intercom button. Is there any way to fix this?

This should solve your problem
https://www.youtube.com/watch?v=XWlFtwTCtqU

Yes. Call forwarding is a feature provided by your telephone company, not a feature of any phone, and the procedure is dependent on the company. For some telephone companies, for example, you forward a call by dialing *72, waiting for a second dial tone, then dial the number to which you want calls forwarded. Please contact your telephone company for their exact procedure.

Plug that phone into the phone system directly. See if it works.

The jack might be bad. Do you get intercom dial tone? If not the jack is goofed up.

If the line button is lit then something within the system has picked it up. If the phone is a multiline set, the line 1 light on the set that is using the line will show green. The line could also be held by either a cordless phone on the system or the voicemail system. The easiest way to clear the line (if the held set isn't apparent) would be to cycle down the power to the phone system for a moment. That will clear the line if its held by the voicemail

Is it on the same line? What about when you call other extensions, is there static?

If it is a line, swap that line and another. If you have static on the same line port, then it is a port problem of the system. If it follows the dialtone, the line from the phone company is the problem.

That doesn't sound good at all. I would first try powering down the system and waiting about 15 seconds or so before powering back up. If the problem remains, the processor was some how damagedand would be best if it was looked at by your vendor.

Programming is done on extension 10 or 11
Press feature 00
Left intercom, Left intercom
#506
mode 1
line 01
number of rings 4
do the same for all lines
Cheers

Each of the modular jacks at the cabinet will accept a single line telephone. I don't think you can "bridge" a phone on 12 year old software, but if there is a spare jack, it will work with a plain old cordless phone. Plug one in, dial 10, and read what extension you have. Here's a manual for a 4.1 Partner system to help you program the ringing. Programming is done from the display phone at extension 10 or 11.

http://public.carl.airpost.net/Avaya/Partner_ACS.pdf

After you find the extension, save yourself the trouble and go to page 447 of the attached pdf. It details how to set the Automatic line preference and ringing of the cordless. The difference is that you will select your lines AFTER the intercom as in ** LIC RIC 1 2 3 4, or 4 3 2 1. This is important! You'll then be able to dial "9" to get an outside line in forward or reverse order and still call internally.

If you find you don't get an outside line when you dial "9", then keep reading the manual, you need to put your lines in groups.

Carl

Sounds like you changed your line selection. Changing line selection on a Partner system is done on either ext 10 or 11.
At one of those ext's press the feature key and "00"
Next press the left hand intercom twice
The display should say system programming

Press the right hand intercom once. The display should say Centralized Programming.

Enter in the extension number that you want to program.

enter **
press the lit line in the order you want the to be used, i.e. line 2 then line 3 then line 4 etc.
enter ** when finished with line selection
.
Press feature "00" to logout
Hope that helps

You will have to call in a pro. We can not put the master passwords on the open internet.