Valer, Thank you for the advice - I have support tickets open with Adtran and Digium and we are tracking down the issue. Hopefully it doesn't come down to adding more hardware, but I'll keep that in mind.
-Justin Killen ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Valer Nur Sent: Monday, January 07, 2013 11:15 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] echo from channel bank It sounds to me like you should first discuss it with adtran. The standard echo cancellation for Asterisk have a hard time cancelling echo generated at the far end, especially if the echo tail/delay is not minimal. 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 <[email protected]> To: Asterisk Users Mailing List - Non-Commercial Discussion <[email protected]> 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 Dynamic Range Compression (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 -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com<http://www.api-digital.com/> -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
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