If this were a forum, I'd say; let's make this a sticky. - Ian
---------- Forwarded message ---------- From: Jim Van Meggelen <[EMAIL PROTECTED]> Date: Mar 23, 2006 11:57 AM Subject: RE: [on-asterisk] Zap channel echo on 4 line Digium TDM card To: Ian Service <[EMAIL PROTECTED]> On a really long local loop it will be next to impossible to eliminate the echo using software. The circuit is being pushed to it's limits, and the software-based echo cans in Asterisk are all somewhat basic. Sangoma offers echo can as an option on their analogue cards, this may be the only way to effectively resolve the problem. As for getting 1004Hz from Bell, you should be able to dial NPA-NXX-1185. You'll need a circuit tester to get any use out of the signal. Nominally, the circuit should have between -3 and -6 dB of loss. The carrier will probably not be able to do anything about the quality of the circuit, but if the loss is worse than -8dB you can usually call in a trouble. Jim -- Jim Van Meggelen [EMAIL PROTECTED] http://www.oreillynet.com/pub/au/2177 "A child is the ultimate startup, and I have three. This makes me rich." Guy Kawasaki -- ------------------------------ *From:* Ian Service [mailto:[EMAIL PROTECTED] *Sent:* March 23, 2006 10:15 AM *To:* TAUG *Subject:* [on-asterisk] Zap channel echo on 4 line Digium TDM card I'm having some echo issues on a couple of lines and I'm pretty sure it's a question of tuning the card or picking echo cancellers, I would just like some thoughts from someone who's done it sucessfully. I've fiddled with the echo training stuff and can't seem to get rid of the echo. I've tried adjusting the gain to a happy level, but I'm still left with the client side (not the callers) hearing echo. I've read about this 1004hz 0db test number, but haven't been able to track one down for Bell. The lines are really long (too long for DSL, so over 7km at least) and in the country, so they're probably not that great, and that could have something to do with it. Either that or the echo canceller that I've picked (whatever the default in the source is) isn't working for me. Has anyone used this hardware with analog lines with sucess? Any tips/tricks you can provide would be awesome. I ran the fxotune program, but I really don't understand what it acutally does, it seems to have had no effect and each line in /etc/fxotune.conf is exactly the same... #=8,0,0,0,0,0,0,0,0 - Ian -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.3.0/290 - Release Date: 23/03/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.3.0/290 - Release Date: 23/03/2006
