echo

[ALF13]

Hello All,
We have a customer with echo problems.
He uses an IP Office 3.2.55 with Avaya IP Terminals.
He uses ISDN lines.
He has echo in internal and external calls.
We replaced the IP Office and the VCM Board (24 channels), but without success.
The network is perfect! The phones have a separate LAN.

Do you have some ideas?

 

[intrigrant]

Is it a echo ( delay ) or sidetone ( no delay )?
A physically different LAN or different ip range?
Did you replace the PRI/BRI cards?
Is the synchronisation setup correctly?
Do all phones use G.711 as a codec?
Did you play with gain settings in the extension settings?
Did you try to disable the AGC on the handsets?
Are the tel sets on the latest software?
Did yo do a network assessment?
Did you sniffed the network with a sniffer like whiteshark? with this tool you can actually listen to the conversation and determine if you have the echo here.

 

[ALF13]

THX for Feedback "intrigrant"!

Is it a echo ( delay ) or sidetone ( no delay )?
I have to check this. Why it is so important?

A physically different LAN or different ip range?
A physically different LAN.

Did you replace the PRI/BRI cards?
No. Do you think that they may cause echo?

Is the synchronisation setup correctly?
Yes

Do all phones use G.711 as a codec?
Yes

Did you play with gain settings in the extension settings?
No - Do you have a suggestion?

Did you try to disable the AGC on the handsets?
We disabled it today

Are the tel sets on the latest software?
Yes

Did yo do a network assessment?
Yes, the network is fine

Did you sniffed the network with a sniffer like whiteshark? with this tool you can actually listen to the conversation and determine if you have the echo here.
The echo occurs only very rare (two or three times at different extensions, we are not able to trace at all phones).

 

[intrigrant]

To determine if it is a echo or side tone is important because echo is caused at the remote site ( traffic delay ) and side tone is a problem in the local phone.
Decreasing the volume during a echo call may help as well, but only if it is a echo call not side tone.
What type of phones do you have?
If it are the xx20 types and it is side tone then contact Avaya Tier3, they can help you.
The gain settings do have effect on echos, i don't know what the best values are but it won't harm to try does it?

 

[ALF13]

To determine if it is a echo or side tone is important because echo is caused at the remote site ( traffic delay ) and side tone is a problem in the local phone.
-> OK, I will check it!

Decreasing the volume during a echo call may help as well, but only if it is a echo call not side tone.
-> We tested it, it didn't help.

What type of phones do you have?
-> 56xx phones.

If it are the xx20 types and it is side tone then contact Avaya Tier3, they can help you.
-> Tier3 should help in every case ;-)
Did you have a similar problem with xx20 phones?

The gain settings do have effect on echos, i don't know what the best values are but it won't harm to try does it?
-> OK, I will check it!

 

[ebuy]

Hi.

On Phone parameters, VOIP Tab, Uncheck Direct media path.

Regards.