[Asterisk-Users] strange echo problem

[W. Kevin Hunt]

Please let me know if you find a solution, I'll do the same.  I received
this from the FISPA list, and have ordered a 6400R which should arrive
Friday for testing.

*** begin paste ***
If you are using asterisk and digium cards, they are very sensitive to
CPU/IRQ speed. We had this issue until we moved the install to a high
end Proliant with a nice bus. IOW a P4 2.4GHZ new generic
machine/motherboard was not having bus throughput as good as a Proliant
Xeon 500/1M Cache. Our far end echo issue went away when we moved to a
production class server. I'm not a programmer but P4's seem to generate
way more inpterrupts than P3's and this means other items on the bus get
their turn last. One other note: Stay away from AMD processors with
Asterisk too. Our experience shows they perform dismally. Slower Xeons
with big cache work better for us and our production box has perfect
audio on both ends now. You can pick up a 6400R Compaq for about $700
now. Awesome machine. We're running ours on a DL-380 with RAID 5 and
it's performing perfectly.
*** end paste ***

W. Kevin Hunt

CCIE #11841
MCSE, Linux+ SME
www.huntbrothers.com
 
-----Original Message-----
 On Behalf Of Ryan Thrash
Subject: Re: [Asterisk-Users] strange echo problem


> We have a strange echo problem.  Maybe echo isn't the correct term. 
> When we make a call f/ a SIP phone (we have several 7960's, some 
> 3coms, and I've even tried a softphone, all on the same 100BaseTX
> network) to the pstn, if the person I'm calling has a PRI or 
> channelized T1 f/ Bell, then the sound is perfect, couldn't be better.
> If I make a call to a person with a plain POTS line, I hear everything

> I say in my earpiece about 1/4 second after I say it.  It's very
> irritating.    We have tried 2 different * boxes, using 2 different 
> T1/PRI cards f/ digium.

For us the echo is a slight faint echo now that we implemented the
echotraining=800, but it's still there. We haven't touched TX/RX gain.

We can also give anyone access and a SIP account if that would be
helpful.

Best regards,
Ryan Thrash