[asterisk-users] Linksys SPA9x2 echo problem

[Matt Riddell]

On 7/12/09 8:11 AM, Dubravko Caric wrote:
> Hi all,
> we have
> this annoying problem with Linksys SPA9x2 phones and echo cancellation. I have read
> posts on other sites about this problem but they are more than one year old and
> people were using older firmware. Linksys/Cisco has released 6.1.5a firmware
> but we still experience the same problems. SPA phones have low sound volume of
> handset microphone and people on the other side (PSTN, GSM) are complaining
> that they hear us very badly. I increased Handset gain to +6 and lower Additional
> handset gain to -3 to get amplification of +3 what gives higher volume on the
> other side but not as much as I would like. That is one problem, the other one
> is that now VoIP to VoIP calls in our company are much louder than those to
> PSTN and GSM, and if we receive two calls immediately one after another there
> is a big difference between PSTN and VoIP calls in the sound volume on our side
> and our users are complaining.
> We are
> using SIP trunk towards PSTN (so I can’t use txgain and rxgain in zapata.conf),
> for GSM calls we are using PORTech SIPtoGSM GW (but I can’t increase volume on
> it anymore because I am getting echo) and I can’t increase volume on Linksys
> phones anymore because our internal VoIP calls would then be much too loud.
> Does anyone
> have same issues even with this new firmware and if so how do you handle those problems?

Sounds to me like you need to speak with the company providing you a SIP 
trunk.

If the calls between VoIP->VoIP are too loud and the calls to PSTN are 
too quiet, then likely the provider needs to check their gain settings.

-- 
Cheers,

Matt Riddell
Managing Director
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