<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=koi8-r">
<META content="MSHTML 6.00.2800.1276" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>
<DIV><FONT face=Arial size=2>Hi!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I need your advice. My problem is that I have very
bad sound quality calling to cellular phone via asterisk router.<BR>There are
some kind of noises and echo effects when you try to speak louder. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have the following components in my call routing
schema:<BR> - PBX with E1 port.<BR> - asterisk router with TE405P
card(32bit/4 E1 ports).<BR> - Teles server with PRI interface card(3 E1
ports) and VTM interface card (4GSM)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have 2 call routing schemas:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> (PBX[E1])-->(*[E1])-->(TELES PRI + VTM
CARD)=>[cellular] (1)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> (PBX[E1])-->(TELES PRI + VTM
CARD)=>[cellular]
(2)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>As you see the difference between (1) and (2) is
intermediate asterisk router.<BR>Using (2) I have acceptible(good) sound
quality, but using (1) I'v got noises and echoes on the cellular's
side.<BR>Asterisk connected with Teles server by the means of the cable. Cable
length is less than 50 santimeters.<BR>Cable is not the root of the problem. The
have already checked this possibility.<BR>We got a lot of solutions based on
asterisk and all the calls have good sound quality. <BR>The only exception is
for (1). What do you think what is the root of my problem?<BR>I also tryed to
modify variouse parametrs values in my zapata.conf to solve the problem.
Useless.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Here is my zaptel.conf </FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial
size=2>span=1,1,0,ccs,hdb3,crc4<BR>span=2,1,0,ccs,hdb3,crc4<BR>span=3,0,0,ccs,hdb3,crc4<BR>span=4,0,0,ccs,hdb3,crc4<BR>#
Span 1<BR>bchan=1-15<BR>dchan=16<BR>bchan=17-31<BR># Span
2<BR>bchan=32-46<BR>dchan=47<BR>bchan=48-62<BR># Span
3<BR>bchan=63-77<BR>dchan=78<BR>bchan=79-93<BR># Span
4<BR>bchan=94-108<BR>dchan=109<BR>bchan=110-124</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>loadzone=us<BR>defaultzone=us</FONT></DIV>
<DIV> </DIV><FONT face=Arial size=2>
<DIV><BR>and zapata.conf</DIV>
<DIV> </DIV>
<DIV>[channels]<BR>switchtype=euroisdn<BR>context=empty<BR>signalling=pri_net<BR>echocancel=yes<BR>echocancelwhenbridged=yes<BR>echotraining=yes<BR>overlapdial=yes<BR>usecallerid=yes<BR>usecallingpres=yes<BR>hidecallerid=no<BR>transfer=no<BR>threewaycalling=no<BR>callwaiting=no<BR>callwaitingcallerid=no<BR>callreturn=no<BR>rxgain=0.0<BR>txgain=0.0<BR>pridialplan=unknown</DIV>
<DIV> </DIV>
<DIV>-------- CUT -------------</DIV>
<DIV><BR>group=4<BR>context=group4<BR>signalling=pri_cpe<BR>immediate=no<BR>echocancel=yes<BR>echocancelwhenbridged=yes<BR>echotraining=yes<BR>overlapdial=no<BR>jitterbuffers=0<BR>channel
=> 94-108<BR>channel => 110-124</DIV>
<DIV> </DIV>
<DIV></FONT><FONT face=Arial size=2><FONT face=Arial
size=2></FONT> </DIV></FONT></FONT></DIV></BODY></HTML>