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Old 07-22-2012, 05:49 PM
rprinsloo rprinsloo is offline
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Default One way echo at the beginnin of a call.

Hi there,

We have the following problem. Any advice would be much appreciated.

IPO 500 v2. Three extn users experiencing echoes on calls. Swapped out for a brand new phone, swapped out the cable from phone to wall outlet, swapped ports on the switch. We have even had a firmware upgrade to the 9608 phones and were hopeful that it might also fix this. This is for three of our users, generally it echoes at the start of a call and then stops after 5 or 6 seconds and is very intermittent.

Q: Is echo suppression turned on?
A: The echo suppression is obviously working as the echo goes away so it's doing its job but why is the echo there at the beginning of the calls?

Q: Does this happen on internal calls as well or only external? Or mobile calls? Is the person on the other end also hearing the echo or is it one sided?
A: Landlines and mobiles – definitely external, not sure if happening internally. There have no complaints from the other end so looks like the echo is only on our side.

Q: Is the issue happening on a certain type of phone or headset at all?
A: Problem was on an Avaya 9608 and then swapped for a brand new one. All phones are 9608’s.

Q: Do you know the model of the POE switch stack for the phones being used?
A: 4548GT switch

Q: Are there VLAN's in place for voice to separate this from your production data traffic?
A: Separate to our data network.

Q: Can you check if the phones being used have AGC (Automatic Gain Control) under audio settings in each phone turned off?
A: They all have this turned on
Note: We have asked the customer to turn off AGC. Waiting to hear if it has resolved or reduced the echo at all.

Q: Are there any other settings we can tweak on the IPO or end points that may remove or reduce the echo?

Thanks in advance.
Rudi Prinsloo
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Old 08-24-2012, 06:45 AM
jtucker1 jtucker1 is offline
Join Date: Aug 2012
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Default Echo on 3 9608 handsets.

You could check also the volume on the 3 handsets have the users raised this to the max if so try and reduce this. Also what codec is being used if it is G729 try and force calls to G711.
IF problems continue then it would be advisable to raise this into Avaya as you seem to have covered the basics already.
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Old 08-29-2012, 04:52 AM
richa83 richa83 is offline
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Has 802.1 qos been implemented on the vlan?
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agc, echo, gain

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