One particular phone does not accept incoming calls ("Not in service") 1

[InternetHotelGuy]

My receptionnist phone, ext. 221, sometimes suddenly stops receiving both internal (intercom) and external calls. When I try to intercom to that phone, I get:

-- Calling <name>
and then

-- Not in service
and then a busy tone from my phone.

I can make both internal and external calls from the affected phone (ext. 221) without any trouble.

I have roaming turned off, so I switch the phone with another unit, and it starts to work again. A few days later, the new phone starts displaying the same symptoms, so I switch it back to the original phone, and the same cycle starts over again (it works for a few days). I can't figure out WHY this is happening or how switching phones temporarily solves the problem.

HELP!!

 

[Serenitynow109]

What "roaming" do you have turned off?

 

[talaphone]

If it is the only one, then it is a bad port

 

[achuchman]

Do you mean "Set Relocation"?

Did you check the copper pairs to make sure there is not a bad connection between the jack and the punchdown?

Did you try swapping the line cord?

When you swap out the phones, does the original phone display the same problem on a different port?