Hi All, This posting regarding PRI voice optimization, on dahdi 2.1.0.4.
we have more than 4 machine running on 4 port PRI card with echo cancellation hardware based. i have enabled echo cancel from chan_dahdi.conf using echocancel=yes, now more than 70% of call get good voice but some of calls having issue for callquality and other voice related issues. now my question is that is there any voice related parameter that we need to set for INDIA specific region and is ther any voice hardware tester for PRI that we can use and tell us our PRI [telco] provider that problem is not from our side. let give some idea . below are my configuration as well. # Autogenerated by /usr/local/sbin/genzaptelconf -- do not hand edit # Zaptel Configuration File # # This file is parsed by the Zaptel Configurator, ztcfg # # It must be in the module loading order # Global data loadzone = in defaultzone = in span = 1,0,0,ccs,hdb3 bchan = 1-15 dchan = 16 bchan = 17-31 span = 2,0,0,ccs,hdb3 bchan = 32-46 dchan = 47 bchan = 48-62 span = 3,0,0,ccs,hdb3 bchan = 63-77 dchan = 78 bchan = 79-93 span = 4,0,0,ccs,hdb3 bchan = 94-108 dchan = 109 bchan = 110-124 [channels] language=en context=from-pstn switchtype=euroisdn pridialplan=local prilocaldialplan=local signalling=pri_cpe usecallerid=yes hidecallerid=no callwaiting=yes usecallingpres=yes callwaitingcallerid=yes threewaycalling=yes transfer=yes cancallforward=yes callreturn=yes relaxdtmf=yes echocancel=yes echocancelwhenbridged=yes echotraining=yes resetinterval=never rxgain=0.0 txgain=0.0 callgroup=1 pickupgroup=1 immediate=no group = 0 channel => 1-15 channel => 17-31 channel => 32-46 channel => 48-62 channel => 63-77 channel => 79-93 channel => 94-108 channel => 110-124
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