General POTs Lines Issue with IPO 500v2

[f3liC]

Hey guys. Hoping that some of you may have seen this problem before. We've deployed quite a number of IPO 500s now (all 9.0 and up, mostly using 9608 handsets). All our customers who are using SIP or PRI seem to have no issues what so ever but a lot of our customers have issues with POTs services. We have equipment located in NYC and some sites in San Francisco. In the instance of Verizon, they no longer run copper for true POTs lines. Instead it is a fiber backend which converts to an RJ45. The pairs split off to a 66 block/krone block for "POTs" lines. With this, we have no issues.

Some times however, we order off of resellers who do not use Verizon. There are different conversations here and there like a straight t1 that turns into POTs or another backend carrier which also does it like Verizon. I'd say half of our customers are having issues with POTs lines alone.

Now in terms of the issues, for the most part we are dealing with echoing issues. They are all inbound calls to the PBX. Only the end user hears the echoing but the person on the other line hears everything perfectly fine. We are not sure what is causing this as again, some customers work perfectly fine while others do not. Are there settings that we can tweak to stop the echoing from occurring?

 

[joe2938]

IP Phones do not play well with pots lines, also maybe try the line impedance adjustment

 

[f3liC]

I read that there was a tool for this under manager but google doesn't bring up any information....

 

[Mic5353]

Anytime you are using Fios line you need to use adsl filters. Fios are not compatiable with ip office. so those filters will do the trick

 

[joe2938]

launch manager, go to lines/analog options/impedance if it is set to automatic then untick then this will allow the system to make an adjustment to the analog line

 

[Mic5353]

or use a ipo 400 trunk 16

 

[f3liC]

Is there no impedance matching tool other than manually setting the options?

 

[joe2938]

it's run automatic and finds the best match

 

[jayjr1105]

This should be made a sticky, here goes...

If you have SIP provided pots lines (Comcast Digital Trunks, Verizon Fiber Lines, ANYTHING that's NOT traditional copper lines)

TURN OFF ALL ECHO CANCELLATION and ECHO REDUCTION

I have done this for my last 5 customers with combo cards and NOBODY has complained of echo. My first 10 customers that had Comcast lines ALL complained of echo/feedback at some point.

 

[f3liC]

Thanks for the SS. I'll try to turn off echoing options and monitor some more

 

[f3liC]

Looks like we're still having echoing issues with both options set to off. Impedance test when not checked on automatic still puts us at 600 (duh, US default). Other than that I don't see why its still echoing. I got a few traces of echoing and we'll send that towards Avaya and see what they say. Last thing to do maybe is a unit upgrade since this specific customer that we tested on is still using 9.0.3

 

[pmcook]

Echo is caused by far end latency. Nothing you can do on your side. Welcome to 19th century phone calls using 21st century technology. There is no solution save for your carrier's will. If they can improve your QoS it could help a lot. Possibly yours is not providing it. Many carriers cannot or just won't. You could try experimenting with the CODECs.

 

[joe2938]

have you gone into the options on the phones them selves and turned off auto gain control?

 

[Telecomboy]

I would also try bringing out a digital set and testing it. I had this happen a few years back with 9608's and finally after going around and around with the carrier I replaced the 9608's with 9508's and it works perfectly.