[Asterisk-Users] Asterisk Echo problems, Urgent, please help,

[Ian Bonham]

Hi Matt,

I've tried using both speaker phone and handset and had the volume levels 
really low and it still occurs. The transmit volumes on the Polycom IP600's 
I have are a fixed transmit volume however, which is set to TIA/EIA-810-A 
standard.
I have changed the gain settings in the VPB driver, but wonder if there is a 
gain setting in * it's self I may have missed?

Cheers for your help,

Ian


>From: Matt <mhoppes at gmail.com>
>Reply-To: Matt <mhoppes at gmail.com>,Asterisk Users Mailing List - 
>Non-Commercial Discussion<asterisk-users at lists.digium.com>
>To: Asterisk Users Mailing List - Non-Commercial 
>Discussion<asterisk-users at lists.digium.com>
>Subject: Re: [Asterisk-Users] Asterisk Echo problems, Urgent, please help,
>Date: Thu, 29 Sep 2005 10:34:19 -0400
>
>Are you certain that the echo on sip-->sip calls is not being caused
>by either a spakerphone or extremely loud handset?
>
>On 9/29/05, Ian Bonham <bon_the_one at hotmail.com> wrote:
> > I'm using a Voicetronix OpenSwitch12 analouge card. It's on the latest
> > driver for Asterisk (2.4.9) and has echo cancellation turned on. This 
>works
> > fairly well on on SIP->POTS calls after it trains up, but there is still 
>a
> > small echo. The SIP->SIP calls are really echoy though.
> >
> > Cheers,
> >
> > Ian
> > (Sorry, only hit 'reply' last time, not 'reply all'!)
> >
> >
> >
> > >From: Tom Hayden <thayden at gmail.com>
> > >Reply-To: Tom Hayden <thayden at gmail.com>,Asterisk Users Mailing List -
> > >Non-Commercial Discussion<asterisk-users at lists.digium.com>
> > >To: Asterisk Users Mailing List - Non-Commercial
> > >Discussion<asterisk-users at lists.digium.com>
> > >Subject: Re: [Asterisk-Users] Asterisk Echo problems, Urgent, please 
>help,
> > >Date: Thu, 29 Sep 2005 09:02:05 -0400
> > >
> > >What kind of POTS trunks/cards are you using?
> > >
> > >--
> > >Tom
> > >
> > >On 9/29/05, Ian Bonham <bon_the_one at hotmail.com> wrote:
> > > > Hi all,
> > > >
> > > > I hope someone can help, as I have an urgent problem.
> > > >
> > > > I've got a production Asterisk server thats been deployed, but we 
>are
> > >seeing
> > > > a strange voice echo problem. There is about a 250ms echo for the 
>users
> > >in
> > > > the office, and they are hearing their own voice back at them.
> > > >
> > > > I'm running the CVS Head code, on RH9.0. This is on a P4 box with 
>2gb of
> > > > memory. The client SIP phones are Polycom Soundpoint IP600's, WiFi 
>ZyXel
> > > > 2000w handsets, and X-Lite (free) PC clients. All see the same 
>problem.
> > > > There is a bridge into the POTS (BT's SystemX) using a Voicetronix
> > > > OpenSwitch12 card and the vpbhp driver.
> > > >
> > > > The echo occurs on both SIP->POTS calls, and SIP->SIP calls. I've 
>tried
> > >a
> > > > number of volume adjustments to correct the echo but it is always 
>the
> > >same.
> > > >
> > > > If anyone has any ideas I'd really appriciate some help, as this is 
>a
> > >major
> > > > urgency,
> > > >
> > > > Many many thanks,
> > > >
> > > > Ian Bonham
> > > >
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> > >--
> > >Tom
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