[Asterisk-Users] Adjusting txgain/rxgain

[Paul Dugas]

I've got a test server with an X100P card that's having trouble with DTMF
detection in an IVR and occasionally generating outbound tones the phone
company misses.  It's also occasionally not recognizing incoming fax calls
and transfering them per my dial plan.  I also have occasional echo
issues; internal caller on a SIP phone hears echo of self calling out via
X100P FXO; called doesn't hear any echos.

Is seems to me (and to the digium support guy I've contacted) that I need
to adjust the tx and rx gains.  The direction I've received for doing so
has been to "just fiddle with them till they sound better" and I've done
so without much success.  I've read the wiki page about using ztmonitor
and adjusting till internal callers talking generates 50% spikes on both
Rx and Tx plots but doing so produces even more echo.

What am I missing?  Am I using ztmonitor correctly?  Is there a more
step-by-step HOWTO for adjusting the gains?  I feel I may need a bit of
hand-holding here. ;)

Paul

PS: I don't have X running or a VGA frame buffer.  I do not have an APIC
in this machine but will be swapping it out with another that does over
this weekend in case the problems are interrupt related.

--
Paul A. Dugas                               Dugas Enterprises, LLC
email: paul at dugasenterprises.com            1711 Indian Ridge Drive
phone: 404.932.1355  fax: 770.516-4841      Woodstock, GA 30189 USA
   [ onsite at the Georgia DOT's West Annex, 404.463.2860 x158 ]