Very poor voice quality

Ashraf.jabali

Joined
Nov 15, 2009
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#1
Hi all

I have problem with the voice quality in some call not all of them

My elastix server has 12 Ap0012 with 12 FXO port conected to PSTN lines

please note that i didn't change any thing in codec configration, or any configration i kept every thing as it is from intallation time till now

more over the agent voice is clear, only the caller voice has bad quality voice


can any one can help me with this problem or has any idea about this

Regards
 

powerline

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Sep 8, 2009
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#2
I have the same problem with you.
The pstn lines are ok, because they are good from provider and bring 60volts, if you meter them.
In 2 FCT Mobile terminals I have this problem and I make rxgain=2 txgain=9 [ you can make tests with these 2 values] and now they can hear me .
The location is \etc\asterisk\chan_dahdi.conf
 

vasistsrinivas

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Oct 26, 2012
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#3
Dear All,

I am facing the Poor voice Quality in Elastix Server, the problem is Agents voice not audible to Customers & Vice Versa.

I am using Ubuntu operating system for Agents (12.04)

1.I check the LAN it is working fine without single packet drop.
2.My PRI card & it configuration is working fine.
3.I have modified the entry in \etc\asterisk\chan_dahdi.conf, the entry rxgain=2 txgain=9
Previously it was 0.0
4.I checked my headset is also working fine.

Still I am facing the same problem, Please help in fixing this problem.

Thanking you
Regards,
Vasistsrinivas
 

danardf

Joined
Dec 3, 2007
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#4
Hi...

I'll try to help you.

First, be careful with the rx/txgain values. It's explained in dB. So +2 and +9 dB it's too much.

About the audio quality, try to add a QoS on your LAN, and try to calculate how many band width you need with your codec curently used. (Side LAN and VoIP of course, not side PCI Card).

Next, try to make any Elastix update (Asterisk, Dahdi...Etc)
 

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