[Asterisk-Users] Small office setup/using analog lines w/ Ast erisk

[VaibhaV Sharma]

On Tue, 2005-08-23 at 14:38 -0400, Andrew Kohlsmith wrote:
> On Tuesday 23 August 2005 13:25, VaibhaV Sharma wrote:
> > * 2 SATA Hdds with H/W RAID (RAID mainly because we plan to do a lot of
> > recording on conference calls + fault tolerance)
> 
> What good does RAID give you on writes?  None whatsoever.  RAID only helps 
> performance on reading.  Fault tolerance aside, I'd get it working first, 
> THEN play with RAID.

I meant to point out that we use RAID not for performance reasons but to
achieve some redundancy to start with, as a lot of other important
systems are going to be integrated with this box.

> > Changing the txgain made the echo worse so I had to settle for 0.0 as
> > its value. Tried increasing / decreasing echocancel from the default 128
> > to 256 or 64/32 but echo got worse both ways. So the only change I could
> > make was the rxgain so that call volume was better on this side. Tried
> > changing the echotraining values too but that had no effect on the echo.
> > At this point, I had rxgain set to 10.5 and txgain set to 0.0.
> 
> Run ztmonitor and try to adjust them as described here:
> 
> http://lists.digium.com/pipermail/asterisk-users/2004-November/071301.html

Yes, I forgot to mention that I used ztmonitor while tweaking the
rx/txgain numbers. The call quality has acceptable for now.

> Also make these changes to your zaptel Makefile:
> add
> 
> CFLAGS+=-march=pentium4
> KFLAGS+=-march=penitum4
> 
> underneath the comments about zconfig.h.  Also you could try defining XLAW as 
> described in zconfig.h to optimize for a few zap channels (not sure if few is 
> < 8 or not).  Finally, enable MMX in zconfig.h.

Considering that we would be increasing the number of incoming lines in
the future, do you suggest moving to a channel bank right away? Maybe
something that will do echo canceling on the hardware level?

> > - Enable the AGGRESSIVE_SUPPRESSOR with MARK2
> 
> Agressive mode turns your phones into half-duplex devices.  When you're 
> talking, you don't hear ANYTHING from the other side, and vice-versa.  That's 
> why you don't hear any echo.

Ah! That explains things a bit.

Thanks a lot,

--
VaibhaV
http://vsharma.net