[asterisk-users] echo from channel bank

[Valer Nur]

It sounds to me like you should first discuss it with adtran. The standard echo cancellation for Asterisk have a hard time cancellingecho generated at the far end, especially if the echo tail/delay is notminimal. 

If adtran can not solve the problem at their end, you can use a server-side echo cancellation that can handle long echo tail. One option is PBXMate.



________________________________
 From: Justin Killen <jkillen at allamericanasphalt.com>
To: Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users at lists.digium.com> 
Sent: Tuesday, January 8, 2013 12:17 AM
Subject: [asterisk-users] echo from channel bank
 

 
I have several adtran 624 with 24 FXS ports hooked up to
analog phones.  The adtran is connected to asterisk via a channelized T1 into a
digium TE820.  I have hardware echo canceling enabled on all channels/spans,
but there is still echo on the lines for both calls out of the trunk, as well
as station-to-station calls.  I’ve checked the output of ‘dahdi
show channel x’ and see the echo turned on:
 
dozer2*CLI> dahdi show channel 149
Channel: 149
Description:
File Descriptor: 158
Span: 7
Extension: 98300326
Dialing: no
Context: from-zaptel
Caller ID:
Calling TON: 0
Caller ID subaddress:
Caller ID name:
Mailbox: none
Destroy: 0
InAlarm: 0
Signalling Type: FXS Kewlstart
Radio: 0
Owner: DAHDI/149-1
Real: DAHDI/149-1
Callwait: <None>
Threeway: <None>
Confno: -1
Propagated Conference: -1
Real in conference: 0
DSP: yes
Busy Detection: no
TDD: no
Relax DTMF: no
Dialing/CallwaitCAS: 0/0
Default law: ulaw
Fax Handled: no
Pulse phone: no
Gains (RX/TX): 0.00/0.00
DynamicRangeCompression
(RX/TX): 0.00/0.00
DND: no
Echo Cancellation:
        128 taps
        currently ON
Wait for dialtone: 0ms
Actual Confinfo: Num/0, Mode/0x0000
Actual Confmute: No
Hookstate (FXS only): Onhook
 
 
I have echocanceller set to HWEC in dahdi/system.conf for
all spans, and I have echocancel=yes in chan_dahdi.cfg
 
I’ve tried reading some echo cancelation articles, but
they seem to be focused on trunks and not on stations.  Also, I’m not
100% sure if this is an issue that I should focus on with asterisk, or if it’s
something I should first take up with adtran?
 
I’m using dahdi 2.6.1, asterisk 10.10.0. 
 
Thanks in advance,
-Justin
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