[asterisk-users] MeetMe() and dahdi_dummy on an embedded system

[Vinícius Fontes]

----- "Shaun Ruffell" <sruffell at digium.com> escreveu:

> On 02/25/2010 11:19 AM, Vinícius Fontes wrote:
> > I'm playing around with an ALIX 2D2 board
> (http://www.pcengines.ch/alix2d2.htm). It's a fanless, x86 system
> using an AMD Geode processor with 256MB of RAM. Also available are two
> network interfaces, two USB ports and one serial port (no keyboard or
> VGA). I'm using the Voyage Linux distro, which basically is Debian
> Lenny optimized for this board.
> > 
> > Asterisk 1.6.1.12 runs fine on the system. The only issue I'm having
> is with MeetMe(). As there's no DAHDI devices attached, I'm running
> dahdi_dummy. Audio gets all choppy on MeetMe(), but works fine for
> other applications such as Playback(). SIP calls also work fine.
> > 
> > Most probably it's a timing issue. I connected an Astribank unit
> with 16 FXS in order to provide timing, and after that I get crystal
> clear audio on MeetMe().
> > 
> > Of course I wouldn't like to have an expensive Astribank attached to
> the ALIX board just to provide timing. So my question is: is there any
> way to improve dahdi_dummy's performance, or maybe some other way to
> get this to work without the need for a physical DAHDI device?
> 
> What version of DAHDI are you using?  As long as the host kernel is
> able to accurately keep accurate wall time, I'm not aware of any
> conditions that would prevent dahdi_dummy in dahdi-linux 2.2.1 from
> working fine, so I'm very curious if this isn't the case.  In fact, in
> the trunk of dahdi-linux dahdi_dummy.ko is off by default and dahdi.ko
> will be able to keep time regardless of whether there are any physical
> spans connected or configured.

Sorry, forgot to include the DAHDI version.

voyage:~# dahdi_cfg -tv
DAHDI Tools Version - 2.2.1

DAHDI Version: 2.2.1
Echo Canceller(s): 
Configuration
======================

I'm almost sure this board's RTC is not very accurate. Is there any way to measure the RTC's accuracy?