Velocity Reviews - Computer Hardware Reviews

Velocity Reviews > Newsgroups > Computing > VOIP > Please help me diagnose/fix this echo

Thread Tools

Please help me diagnose/fix this echo

Ramon F Herrera
Posts: n/a
Just when I was ready to work on the deployment of several hundred
Asterisk SIP phones, I bumped into a serious potential show stopper: an

I went to Astricon and attended the Echo Session. I also happen to know
some (not a lot) about impedance matching, etc.

My problem is mainly related to the DTMF digits when my users call an
IVR system, from a SIP phone to a PSTN IVR.

Would some of you folks out there (preferably knowledgeable) please
dial into the Boston Verizon voice mail number from your SIP phone:


and then leave a message, for instance, in my voice mail:


(you don't have to leave anything) In fact, you will probably not be
able to leave any message because the DTMF digits will not be

These are my settings:

Asterisk 1.2.0-beta2
Sipura 2100
Cisco AS-5300

A colleague called from his Linksys digital hardphone and was able to
leave me a message (i.e. the DTMF digits were recognized by Verizon),
but then when he tried from a Sipura ATA he failed.

It looks like it is worth purchasing the whole telephone (as opposed to
a ATA+phone combination) if you want to prevent echo.

I tried changing the "FXS Port Input Gain" and "FXS Port Output Gain"
from the -3 default to -2 and -1, but no luck.


-Ramon F Herrera

Reply With Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for Help with the DOS Mode and Echo Caommands red belair Computer Support 3 10-07-2004 02:03 PM
Overloaded "echo" command in perl within system (backtick, exec) call Leszek Dubiel Perl 3 05-12-2004 11:43 AM
HELP! HELP! PLEASE, PLEASE, PLEASE tpg comcntr Computer Support 11 02-15-2004 06:22 PM
please help... learn C++ please please please :) KK C++ 2 10-14-2003 02:08 PM
echo echo echo craig judd Computer Support 1 09-23-2003 08:53 PM