Basic Telephony

I have an issue with a phone jack that I am looking for some basic direction in troubleshooting.  I am being asked to support a phone system, even though I have no experience with telephony.   The phone jack just stopped working and nothing is labeled so I am not sure how to trace to where the line is terminated.  There are two sets of punch down blocks located on opposite sides of the office.  
Any idea on what would cause a phone jack to stop working all of sudden ?  No other lines are showing a problem.   There is another phone jack located close (about 10 feet) from the jack that is having the issue.  Is a way to switch the lines where they are terminated? If so would this be done with the punch block or in a patch panel? As I mentioned nothing is labeled and there are 2 telco closets so it is going to be difficult to pinpoint.
Thanks for any feedback/direction anyone can give.
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
The first thing is to get into the PBX setup and see if that jack is enabled or turned off.  You may have to call the service company for the PBX to do that.
Dave BaldwinFixer of ProblemsCommented:
First, are you using regular home-type phones or a PBX-based phone system like a Cisco or a Nortel?
fjkaykr11Author Commented:
It is Voip on an Avaya system.   It looks like it is definately something with the specific extension or phone jack. If I move the phone aother jack I get a signal.
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DvonHoltzConnect With a Mentor Commented:
As it's a VoIP system, next question would be is it a IP endpoint (Ethernet) or an analog endpoint? If its an ethernet, than chances are someone change the switch port config and the voice vlan is no longer defined.
Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
Even it's an analog connection, that line could have been disabled in the PBX.  And there is the possibility that the wiring went bad.  I have had that happen with old wiring.   Or disconnected at the punch-down blocks.  That has happened when 'other people' decided we didn't need that line...

Your choices are to hire a phone tech with experience on the Avaya VOIP system... or begin a very educational experience where you become a phone tech.  There is test equipment you need to check the line but you also need to know how that system works so you will know what to look for.

Or you might get lucky and be able to put it off until the next time...
greg wardSystems EngineerCommented:
Or if you have some IT skills plug the socket into a pc. In the comms room plug the port into a normal switchport.
If the pc works then comment 36593027 summs up the issue and you would need the person to undo the change.
If it does not work you need someone to put in a new cable or check the cable that is there.

fjkaykr11Author Commented:
I was wrong it looks like it s IP PBX, not Voip. I don't think I can use a PC to test this.
The lines at the punch block are locked off from others so I don't think it is an issue there.
I still have no idea on where to look.  
fjkaykr11Author Commented:
Ok. Thanks for the feedback. Looks like I am going to have to hire someone to give me more direction.
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