It's not a host CPU issue as Asterisk is running on a barely-glued-together old Dell 1GHz P3 with 256MB of RAM and something like 40GB of disk space.
I think the rxgain and txgain are important... if you jack those up too much, the telco echo can can't keep up anymore and you hear far-side echo. I've seen Asterisk's echo can work pretty effectively at all kinds of gain settings, but that was on a digital circuit (haven't screwed with my analog version at home too much).
At any rate, if you're having issues, I'd make sure echo cancellation is *on* both generally and during a bridged call. If that's true, I'd set rxgain and txgain both to zero and see if the echo simply goes away. If so, then I'd adjust the gain upward as needed to equalize the line until it sounds right or an echo appears and back off just slightly from that value.
On Nov 3, 2004, at 7:23 AM, Dave Henderson wrote:
Hi Michael,
You mention the X100P -- I agree, it's not a great card. I've had all sorts of issues with mine, though I've lived with it for one of my not-so-important Asterisk PBXes.
One device it seems you haven't tried is the Digium TDM400P with an FXO module... I've used a pile of these, and have generally been very pleased with them.
-- Dave Henderson Customer Service Manager The IT Department, Inc.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: November 3, 2004 10:14 AM To: Asterisk Group Subject: [Asterisk-Users] An anniversary and a lament for FXOs
This week marks one year since I first setup an Asterisk server in the
hopes of transitioning my home office to a total VoIP system. The
process has been an incredible learning experience. I've tried numerous
IP hard phones, eventually settling upon the Polycom IP600 as my choice.
I've also used multiple ATAs including all the Sipura products.
Using Asterisk has been a challenge, a thrill and (when its working) a
joy. However, the one thing that I am not satisfied with is the
performance of the FXO interfaces that bring in my PSTN lines.
I've tried X100p cards but found them horribly unreliable. I presently
use Sipura SPA-3000s but they're only marginally better. How is it that
my Panasonic 4 line SOHO phone system (KX-TG4000B) can have four stable,
reliable FXOs with no echo at all in a device with a total cost of
<$500? It seems to me that there ought to be hardware available that
behaves just as well, but bridges the PSTN to the SIP/IAX domain?
I've read a lot on the list about how difficult designing FXOs can be,
but that flies in the face of the fact that every small multi-line phone
system has them...and without expection those behave better than the
devices I've been able to try with Asterisk. The Sipura SPA-3000 has
several settings to adjust for line impedance and inductive/capacitive
line loading....lots of settings, but it provides nowhere near the basic
performance of one of the lines on the Panasonic KSU. It's simply mind
boggling.
So, while I've posted with respect to FXOs previously, I must ask again....what FXO interface device can anyone recommend from real experience?
Michael
P.S. - I even investigated switching my lines to ISDN to get around the need for FXOs, but SBC won't do it where I live. -- Michael Graves [EMAIL PROTECTED] Sr. Product Specialist www.pixelpower.com Pixel Power Inc. [EMAIL PROTECTED]
o713-861-4005 o800-905-6412 c713-201-1262
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