Hello Quick update... I think my problem is fixed. As Jorge was suggesting, the echo canceller needs to be activated through the echocan command. I was under the wrong impression that the HW EC was starting automatically, and did not need any activation command. Sound quality is may be not as good as without, somehow a bit mettallic, but I am not sure if it is just an impression or what ! Thanks for your help Regards, J. On Thu, Apr 15, 2010 at 8:24 PM, Jean C?rien <cerien.jean at gmail.com> wrote: > > All : many thanks for your replies - I havent replied before as I was > trying to get an environment where I can reproduce this echo. Only some > progress so far. > > > A few questions re your comments: > > - is there a way to disable via software the VPM module ? I take the > suggestion of removing physically the board as interesting, unfortunately, > the server is in a remote location with strict access conditions... if it > could be done by software, that would be great > > - I've upgraded to the latest dahdi (2.3.0) tonight, I will see if there > are any improvements > > - regarding echowhenbridge, echocancel, etc... do these parameters apply to > hardware echo canceller as well ? my understanding was this applied only to > software EC > > - does anyone has a proper doc for this module ? > > > Many thanks for your precious help, > > J. > > > > On Thu, Apr 1, 2010 at 7:07 PM, John Bigelow <jbigelow at digium.com> wrote: > >> I suggest to also upgrade DAHDI to the latest version which contains >> newer firmware for the VPMADT032. >> >> -John >> >> Jean C?rien wrote: >> > >> > Hello >> > >> > I have the following setup: >> > >> > Ast1.6.1.18+Chan-SS7 1.3 --> TE221 Board + VPMADT032 hw echo >> > canceller --> E1 to Mobile MSC E/// AXE10 >> > >> > I assume the hardware module is detected as the following message >> appears: >> > wcte12xp: VPM present and operational (Firmware version 117) >> > >> > Calls are initiated via a SIP Client with G729, codec available on the >> > server. >> > >> > On most of the calls, the quality is crystal clear - however, on some >> > specific numbers, there is a huge echo perceived on the SIP client. >> > >> > This happens to some specific numbers, though 99%+ of the calls are ok >> > - all these numbers (with or without echo) are served by the same E1, >> > so nothing changes on my side. I am connected to a mobile GSM >> > operator, when I call this number from one of their cellphones, there >> > is no echo... >> > >> > >> > Any suggestions as what to check ? >> > >> > Many thanks, >> > >> > J. >> > >> > >> >> -- >> _____________________________________________________________________ >> -- Bandwidth and Colocation Provided by http://www.api-digital.com -- >> >> asterisk-ss7 mailing list >> To UNSUBSCRIBE or update options visit: >> http://lists.digium.com/mailman/listinfo/asterisk-ss7 >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-ss7/attachments/20100419/b3125cb5/attachment.htm
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