R4+Z

The jitter buffer could be set too long!

smoom

Is the echo happneing on internal phone to phone calls, or phone to outside calls? What type of phone lines are using PRi, POTS??

Telco_nec

R4+Z
how can I modify the buffer?

smoom
It is PSTN lines (analogue lines) ... it is not happenening all the times ... some times when I pick up the phone beofre dialing outside, I am getting the sound of every movement in the room or my breathe sound .. i.e , Echo.

smoom

The issue with using copper trunks and IP is an impedance mismatch the jitter buffer normally will not help when the issue involves copper trunks. Make sure that you have NLP set to on and that you have the correct Pad settings for the trunk route that your copper trunks are in.

Check Command 0A22> Interface #> 0
Then you could adjust the pad for the trunk route you are working on.
3519 > Trunk Route for POTS Lines > 6 3db transmit/receive

post back and let me know if it helps

Telco_nec

thanks my friend ... I will check those cammands and come back...

R4+Z

If you have this problem as soon as you pick up the phone it is unlikely to be a jitter buffer problem. Are you sure it's not something simple like setting the volume lower?

dmad

In my experience this is a tricky one. You're dealing with people's individual hearing and likes/dislikes and sometimes there is a problem on certain types of call - like over trunks but not internally, and if you up the gain on one side, you potentially ruin something else.

If at all possible, i would nip it in the bud and say 'this is how it is'. If it's only internal and one very few calls, then you may get away with it. If it's something the customer is hearing then you may be expected to do more.

Also take a look into the handset volume and remember somewhere is the option to raise the MIC on the handset volume also (not just the hearpiece volume using the up and down buttons).

Using locations and pad settings also tend to make a difference. Many don't need resets and can be tested on the go.