Avaya Partner-18D office phone-After an intercom call, the receiver's phone rings

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

Partner ACS systems come with Centralized programming instructions. Most of them starting with Feature 00 Left Intercom twice and Right Intercom. When you dial an extension, the lights will be solid or blink according to how it's programmed and you press each button to turn on or off or delay ringing.

Your system administrator should have a book.

Carl

That one doesn't sound too good.
You could perform a reset through programming which should clear the scratch pad.
Thats done by entering programming on either ext. 10 or 11
Press feature 00 then the left hand intercom twice.
Next enter # 728, the display should say reset save all then reboot the system.If the problem is still there, then the processor is malfunctioning and will need to be replaced.

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.

On extension 10 or 11
Press Feature 00
Left Intercom, Left Intercom, Right Intercom
Input your first extension that you want to ring.
Press desired line to ring until display say Immideate.
Press Right Intercom for next Extension.
Cheers.

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

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

Changing ringing 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.

Press the line that you want to ring.
A solid light on the line means immediate ringing
A slow flashing light means delayed ringing (meaning the phone will wait 3 rings before starting to ring.)
A fast flashing light means no ringing.

When finished with that station press the right hand intercom and enter in the next extension to program and set ringing accordingly.


Press feature "00" to logout
Hope that helps

A simple Google search found a manual covering the Avaya (Partner) 18d phone.

It can be found here:

http://www.getempire.com/media/guides/manuals/partner/456804_6.pdf

Good luck.

Are you trying to change if it rings or how it sounds when it rings?

The phone you have (Partner 18D) can be used on several different Avaya phone systems that all program differently. To change when it rings, this would need to done in the system programming (not the phone) All the manuals are avaialble on Avaya's web site but you need to know which system you have before you can start searching. www.avaya.com