[asterisk-users] Digium B410P or Sangoma A502D?

[Tzafrir Cohen]

On Fri, Apr 25, 2008 at 01:37:15PM +0200, Patrick wrote:
> 
> On Thu, 2008-04-24 at 20:17 -0400, Steve Totaro wrote:
> > The Sangoma kernel drivers are different than Zaptel, while running
> > the install script you are asked if you would like to generate the
> > Zaptel configs but it is not required, you must also run wancfg to
> > configure the cards beyond the Zaptel configs.  The Sangoma drivers
> > kind of run on top of the Zaptel.
> 
> Thanks for clearing that up. That's what I thought too.
> 
> > It seems that the newest wanpipe drivers and Zaptel 1.4 work without
> > the D chan patch which is very nice IMO, I hate patches.
> 
> That's good to hear. The less patches the better.
> 
> >   I have run
> > the BRIStuff install and it has tons of patches!  Kind of scary but it
> > works for it's purpose.
> 
> Yesterday I had to update a set of 1.2 Asterisk RPMs with the latest
> Junghanns patch. So I downloaded the latest Junghanns patch and had a
> look. Wow, that's a serious set of patches to zaptel, libpri and
> asterisk. Kind of scary indeed.
> 
> > I have only done BRI once but there was absolutely no echo by simply
> > setting echocancel=yes, echocancelwhenbridged=no.
> 
> Personally I use an Eicon Diva Server card with onboard echo can in my *
> box and calls to cellphones can still generate a ton of echo. Same
> applies to calls to POTS phones that are hooked up to copper that's in a
> rather bad state or use a €5 phone.
> 
> > I hear "might as well get the hardware EC board" quite a bit, but on
> > all the many dozens of PRIs I have installed, software EC has been
> > adequate (if needed at all).  It would have meant quite a bit of
> > wasted money that was better spent on a nice 48 port gigabit switch.
> 
> Lucky you :) Or your upstream telco has deployed some serious echo can
> boxes throughout its network doing echo cancellation already for you.

With the channels count of BRI, there's typically much less of a problem
with software echo cancellation. 

BTW: OSLEC is said to be usable with mISDN as well. Never really tried
it.

> 
> > I have tested both ways (hardware vs. software), no difference really
> > (Sangoma).  Sangoma actually sent me one of each before purchasing
> > seven quad cards to test if hardware EC was going to be required for
> > one deployment.  I returned the hardware EC card and ordered seven
> > quad PRI cards.
> > 
> > Maybe I am just lucky or have not had enough exposure to BRI but ISDN
> > is ISDN, right (it really is a question, I don't know)?
> 
> EuroISDN is EuroISDN. Doesn't matter if it's BRI or PRI.

It slightly does. PRI does not require supporting PtMP. Thus BRI requires
better EuroISDN support.

-- 
               Tzafrir Cohen
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