I believe the TE212 has echo cancelling, the TE220 does not.
http://www.digium.com/en/products/hardware/te212p.php
http://www.digium.com/en/products/hardware/te220.php

On 8/1/07, Reza - Asterisk Enthusiast <[EMAIL PROTECTED]> wrote:
>
> Best to ask Digium or a reseller.  I have no idea, as I have never used
> those, nor had the need to.   Sangoma would be your better bet, as they
> would be quick to respond to your needs.   If you post the question
> publicly, vs. privately to me -- you are likely going to get a greater
> amount of responses.
>
> Best regards,
> Reza.
>
> ----- Original Message -----
> From: "Zahra Bahar" <[EMAIL PROTECTED]>
> To: "Reza - Asterisk Enthusiast" <[EMAIL PROTECTED]>
> Sent: Wednesday, August 01, 2007 2:54 AM
> Subject: Re: [biz] compare of TE212 & TE220 card
>
>
> > do you know why TE220 is cheaper than TE212?
> >
> > ----- Original Message -----
> > From: Reza - Asterisk Enthusiast <[EMAIL PROTECTED]>
> > To: biz <[email protected]>
> > Sent: Tuesday, July 31, 2007 2:51:58 PM GMT+0330 Auto-Detected
> > Subject: Re: [biz] compare of TE212 & TE220 card
> >
> > I would recommend a Sangoma card for reasons concerning out of
> experience.
> >
> > ----- Original Message -----
> > From: "Zahra Bahar" <[EMAIL PROTECTED]>
> > To: "biz" <[email protected]>
> > Sent: Tuesday, July 31, 2007 6:10 AM
> > Subject: [biz] compare of TE212 & TE220 card
> >
> >
> >> Hi,
> >> which one of TE212 or TE220B card are better for conference call ?why?
> >>
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