<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Arial; background-color: transparent; font-style: normal;"><span>It sounds to me like you should first discuss it with adtran. </span><font face="Arial" size="2"><span class="yui_3_7_2_18_1355984975739_218" style="font-size:10.0pt;font-family:Arial;"></span></font><font size="2"><font size="2"> </font>The standard echo cancellation for <font size="2">Asterisk have a hard time cancelling<font size="2"> echo generated at the far end<font size="2">, <font size="2">especially</font><font size="2"><font size="2"></font> if the echo tail/delay is not<font size="2"> minimal</font>. </font></font></font></font></font></div><div style="color: rgb(0, 0, 0); font-size: 10pt; font-family: Arial; background-color: transparent; font-style: normal;"><br></div><div
style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Arial; background-color: transparent; font-style: normal;">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.<br><font face="Arial" size="2"><span class="yui_3_7_2_18_1355984975739_218" style="font-size:10.0pt;font-family:Arial;"></span></font></div><div><br></div> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Justin Killen <jkillen@allamericanasphalt.com><br> <b><span style="font-weight: bold;">To:</span></b> Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users@lists.digium.com> <br> <b><span style="font-weight:
bold;">Sent:</span></b> Tuesday, January 8, 2013 12:17 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> [asterisk-users] echo from channel bank<br> </font> </div> <br>
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<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">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:</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">dozer2*CLI> dahdi show channel 149</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Channel: 149</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Description:</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">File Descriptor: 158</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Span: 7</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Extension: 98300326</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Dialing: no</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Context: from-zaptel</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Caller ID:</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Calling TON: 0</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Caller ID subaddress:</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Caller ID name:</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Mailbox: none</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Destroy: 0</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">InAlarm: 0</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Signalling Type: FXS Kewlstart</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Radio: 0</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Owner: DAHDI/149-1</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Real: DAHDI/149-1</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Callwait: <None></span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Threeway: <None></span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Confno: -1</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Propagated Conference: -1</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Real in conference: 0</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">DSP: yes</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Busy Detection: no</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">TDD: no</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Relax DTMF: no</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Dialing/CallwaitCAS: 0/0</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Default law: ulaw</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Fax Handled: no</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Pulse phone: no</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Gains (RX/TX): 0.00/0.00</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Dynamic</span></font><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">
Range</span></font><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> Compression
(RX/TX): 0.00/0.00</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">DND: no</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Echo Cancellation:</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> 128 taps</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> currently ON</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Wait for dialtone: 0ms</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Actual Confinfo: Num/0, Mode/0x0000</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Actual Confmute: No</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Hookstate (FXS only): Onhook</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">I have echocanceller set to HWEC in dahdi/system.conf for
all spans, and I have echocancel=yes in chan_dahdi.cfg</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">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?</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">I’m using dahdi 2.6.1, asterisk 10.10.0. </span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv818834327MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Thanks in advance,</span></font></div>
<div class="yiv818834327MsoNormal"><font face="Times New Roman" size="3"><span style="
font-size:12.0pt;">-Justin<font color="navy"><span style="color:navy;"></span></font></span></font></div>
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