[Asterisk-Users] Frustrated with echo...

[Lorentz Hinrichsen]

I've had very poor results with the Digium cards, I am using a couple of the
new Sangoma ones now (they are cheaper and have hardware echo cancellation).

The digium boards proved almost impossible to completely eliminate echo, and
I had random failures over time.

On 4/4/06, Steve Jones <sjones at ftdata.com> wrote:
>
> For phones, I've got a GS 101, a Sipura 841, and two analog phones hooked
> to an GS386 ATA (one phone per port).
>
> My troubles seem to be regardless of which phone is used, so I dont think
> it's on the phone-end of asterisk, but rather where I interface w/ Vonage
> and Verizon via POTS FXO...  My SIP connections to the outside world have so
> far been good [frantically knocking on wood]
>
> I did go ahead and order the digium card yesterday evening, so I'm hopeful
> this will help.  I had played with the gain, and was able to discern a
> difference, but it seemed to make some scenarios better, while making others
> worse, so I'm hoping the real digium card/drivers will just be smarter about
> handling it dynamically.  Of course, my wife, who's a stay-at-home-mom is
> the biggest user of the system, but she's not interested in being a techy,
> so getting her to interrogate all callers about which number they dialed,
> etc.. and logging her opinions of the quality of the call hasn't
> worked!  ;-)
>
> I also have some Cisco phones, but I haven't configured SCCP on my system
> yet, and dont want to use SIP on these phone (mostly to force myself to
> learn to configure SCCP on *) so that's another aspect that may help me
> after this weekend!
>
> Good point about the interrupts - I dont know the answer to that, but
> hopefully that'll also be a non-issue after I get the new card, and
> therefore have only one PCI slot handling everything.
>
> Thanks for the ideas!!
> -Steve
>
>
> ________________________________
>
> From: Mike Dent [mailto:mcdent at gmail.com]
> Sent: Mon 4/3/2006 3:46 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Frustrated with echo...
>
>
>
> On 4/3/06, Steve Jones <sjones at ftdata.com> wrote:
> >
> > I've been using my Asterisk (At my house - 2 modem-type fxos, and an
> > assortment of SIP endpoints for phones) for about 5 weeks now, and I've
> been
> > really happy with it, but I'm still having an echo problem that I've
> > exhausted google with, and can't get straight...
> >
> > I think I've determined that because I'm using $7 voice modem clones for
> my
> > FXOs that bad echo is going to just keep being a pain to me...  I think
> I
> > should have only tried going through "proof of concept" state with them,
> > switching to something a little better quality when it was time to
> actually
> > commit to Asterisk.
> >
> > So, my question is "What's better and why:  1: a 'real' digium PCI card
> with
> > two fxo plugins, or using a couple external SIP fxo units like a
> > grandstream, zoom, or similar"  Personally, I think it would be
> desirable to
> > keep the FXOs out of the asterisk box itself, just to give me future
> > flexability to move to whatever the platform of the day I want to put
> > asterisk on, without dealing with a PCI card to move, but if the
> consensus
> > is that the voice quality and support for the digium board is the best,
> then
> > that's what I'll do..
> >
> > So, any comments on relative quality of these devices, and/or ones I've
> > missed?
> > 1:  Grandstream HT-488
> > 2:  Zoom 5801/5802
> > 3:  DGM-TDM02B  (TDM 400P with two FXOs)
> >
> > Are there any IAX2 FXOs that I'm missing?  That seems to be an area
> that's
> > oddly not taken care of...
> >
> > Any hints would be greatly appreciated!
>
> Steve,
> I have a similar setup at home, although I am in the UK. I've got the
> echo fairly well under control, however it seems much less when using
> my Cisco 7960 rather than
> the Grandstrean BT102 phone.
> Have you tried dropping the gain?
> Have you made sure you have both cards on seperate IRQ's which are not
> in use by network, video etc? I disabled USB and on board audio in the
> BIOS to help free up IRQ's.
> I think your best option is the TDM400 card, or perhaps consider the
> Sangoma card with a dual FXO module, maybe slightly cheaper!
> I'd be interested what SIP phones you are using and if echo differs
> between them.
>
> Mike
>
>
>
>
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