"false" ringing from one of the analog lines

[jyang12]

Hi all,

we have some issue with one of the analog lines that connects thru the additional analog trunk card on the IP Office 7.0 V2. It's either the line or IP office keeps thinking there is an incoming call so it keeps ringing non-stop. I have to temporarily disable that port but wonder if there is any setting I can tune to make IP Office less sensitive. Thanks for your input.

 

[jyang12]

Any comments guys?

 

[Westi]

TBH there is not really a setting that would make the IPO less sensitive but I would try and see if you are close to a CO and then maybe use resistors to get the line a little more into the moderate range.
Also make sure that you run the impedance matching tool as that has proven to help with line isues.

Should all that not help swap the lines and see if it follows the line or if it stays with the port. If it stays with the port replace the analog trunk card or use a different slot (has helped in the past a few times to fix weird stuff)

Cheers

Joe W.

FHandw, ACSS (SME), ACIS (SME)

http://convergednetworks.ca

Give a tech a solution and he will be back tomorrow to ask you the next question, teach a tech how to read the manual and he will be able to solve the problems for a life time.

 

[jyang12]

Thanks Joe. Can you elaborate on use resistors to get the line into the moderate range? I'll also try the impedance tool again(although I think we've used it when the IPO first installed). Thanks

 

[Signo]

I had this happen once, I found a bad jumper or connection of all things causing this. Pulled the jumper wire and redid it and it went away. This was after a lightning strike though, not just out of the blue. I went through everything I could think of and the jumper was the last thing that I would of ever thought would cause it. Sometimes its the simple things.

 

[Telecomboy]

I would first move the effected line to another port that is not having the issue and see if the issue stays with the port or moves with the line itself. I have had bad ports on an analog trunk 16 before.

 

[Westi]

I would go with Telecomboy's suggestion and swap ports, that is the easiest and least intrusive way to start

Should then the problem stay with the line go ahead with the resistors:

you need to measure your lines to see if resistors are a valid option
take a multi meter and set it to mA and connect straight to the T/R and see what it shows
If you get something between 25mA and 35mA then you are golden, if it is lower then resistors are the absolute wrong way to go but if you have measurements above 35mA then you can use 2 identical resistors and put one in the Tip and the other one in the Ring side of the line (you need both to keep the line homogenous) and re-measure the line. I have a whole bunch of them accumulated over the years and depending on the measurement I start with anywhere form 600 Ohm to 3.6 kOhm and then keep measuring to get it somewhere in the low 30mA range.

do a measurement and see if that is an option for you.

Joe W.

FHandw, ACSS (SME), ACIS (SME)

http://convergednetworks.ca

Give a tech a solution and he will be back tomorrow to ask you the next question, teach a tech how to read the manual and he will be able to solve the problems for a life time.

 

[jyang12]

Thanks guys, I'll try these out after work tonight - can't let the phone keep ringing or I'll hear from the receptionist pretty soon