<div><div class="gmail_quote">On Tue, Nov 30, 2010 at 11:25, Carlos Chavez <span dir="ltr"><<a href="mailto:cursor@telecomabmex.com">cursor@telecomabmex.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
I am having a problem with a Rhino channelbank. I have an Asterisk<br>
server running 1.6.2.9 and DAHDI 2.4.0 on a CentOS 5.5 system. We have<br>
a TE420 card with the first port used in E1 mode (R2, 20 channels) and<br>
the fourth is in T1 mode for the channelbank. We are using MG2 echo<br>
cancellation.<br>
<br>
The Rhino unit has 12 FXO ports. Five are GSM adapters and another<br>
five are regular phone lines. We are having problems with the GSM lines<br>
at the moment. When we enable MG2 on those lines we get dropped calls<br>
or noise or the call cannot go through. If I disable eco cancellation<br>
it mostly works (one port still drops the call almost immediately) but<br>
there is echo.<br>
<br>
Here is the DAHDI configuration:<br>
<br>
# Span 4: TE4/0/4 "T4XXP (PCI) Card 0 Span 4" B8ZS/ESF<br>
span=2,2,0,esf,b8zs<br>
# termtype: te<br>
fxsks=94-105<br>
#echocanceller=mg2,94-105<br>
<br>
Here is chan_dahdi.conf<br>
; Span 4: TE4/0/4 "T4XXP (PCI) Card 0 Span 4" B8ZS/ESF<br>
group=4<br>
context=from-pstn<br>
signalling = fxs_ks<br>
accountcode=Celulares<br>
faxdetect=no<br>
echocancel=no<br>
echocancelwhenbridged=no<br>
echotraining=no<br>
channel => 94-97,104-105<br>
<br>
Does anyone have any suggestions on how to enable echo cancellation on<br>
the Rhino Channelbank?<br>
<br><font class="Apple-style-span" color="#888888">
--</font><br><font class="Apple-style-span" color="#888888">
Telecomunicaciones Abiertas de México S.A. de C.V.</font><br><font class="Apple-style-span" color="#888888">
Carlos Chávez Prats</font><br><font class="Apple-style-span" color="#888888">
Director de Tecnología</font><br><font class="Apple-style-span" color="#888888">
+52-55-91169161 ext 2001</font><br><br></blockquote></div><div><br></div><meta http-equiv="content-type" content="text/html; charset=utf-8">Hello Carlos,<div>Channel banks do not have any echo-cancellation to be enabled, they are a simple pass-through device. I suspect the echo you are hearing is the result of an impedance mis-match, especially since this is only happening with your GSM adapters. I would suggest opening a support ticket with us directly, <a href="http://support.rhinoequipment.com">http://support.rhinoequipment.com</a>, and be sure to include all the details you can such as the make and model of the GSM adapters.</div>
<div>One other test you might try - If you connect a regular telephone directly to one of the GSM adapters, do you hear echo?<br></div><div><br></div>-- <br><br>Regards,<br>Bryce Chidester<br>Rhino Equipment Corp.<br><br>
</div>