v10 spk1 - Users claim ECHO during external calls

[jr3151006]

Hi,

we have v10spk1 running on XP spk3 and some Cisco phone (SPA 502g and 504g - using P.O.E switch) and 'SOME' users are claiming regarding echo during external calls (outbound/inbound via sip trunk or via gateway - SPA400).

How can I debug this issue? It would be related with network latency? Codec used in the phones?

* I´m monitoring right now through SNMP my ADSL modem connection, 3cx server and so on.

 

[KerryG]

Could be that you just need to turn the microphone gain on the phone down.

 

[willow]

echo is normally an impendence issue between two wired deviced. I would try Kerry's idea first, alot of echo has been fixed by simply turning the volume down or turning off automatic gain control for the handset.

 

[KerryG]

I would agree but if 'some' users are complaining of echo with these particular phones, I am leaning towards it being an acoustic echo via feedback in the handset and not an impedance issue since it is not affecting everyone.

 

[jr3151006]

I cannot found an option to enable/disable the Gain for the headset but I found the information bellow. To me it seems that the 'gain' is disabled to all options. It´s Correct?

http://IPphone/admin/advanced
Menu Voice/Phone/
Audio Input Gain (dB)
###################
Handset Input Gain: 0
Speakerphone Input Gain: 0
Headset Additional Input Gain: 0
Headset Input Gain: 0
Handset Additional Input Gain: 0
Speakerphone Additional Input Gain: 0

 

[KerryG]

Try
Handset Input Gain: -2

Try to find a balance where the echo stops but the volume to the other person isn't too low.

 

[jr3151006]

Ok Kerry,

I´ll try and monitor.

tks a lot!!

 

[netswork]

Where did you find to adjust the gain? I dont see anything in the phone provisioning files for gain.