Per your readout it is off. A normally operating channel would look
something like
Echo Cancellation: 128 taps, currently ON
You are restarting asterisk as you make changes and not just
reloading right:)
On Jun 2, 2005, at 3:40 PM, Don Murray wrote:
I have appended my /etc/asterisk/zapata.conf and my /etc/
zaptel.conf files. I am running Asterisk 1.0.7 on a P3 800 MHz
system in an office with around 20 sip phones. We are using a
Digium Wildcard TE110P that is connected to a T1 line with 8 lines
enabled. We have been experiencing irritating echo on the sip phone
side when local lines are called.
After reading a lot of echo related threads, I think I understand
the 4-wire to 2-wire cause of this echo. I have noticed that when
calling long distance and with some cell phones there is no echo,
which is consistent with a system that has echo cancellation on the
destination end.
So, I've been trying to enable software echo cancellation to see if
it will improve the situation. If you look down to see my
zapata.conf file, you will see I've tried to set echocancel and
echocancelwhenbridged, and that I've also mucked around with
echotraining. None of these appear to be doing anything.
However, I *think* this is because they are not being enabled
properly, because when I try to see the details of an active zap
channel (see zap show channel command) it says "Echo Cancellation:
0 taps unless TDM bridged, currently OFF". I'm not sure if I'm
doing this debugging right, so I wanted to ask people both :
(a) am I enabling echocancel correctly? I've heard that sometimes
these parameters can behave differently depending on the order they
appear in the file??
(b) am I doing the right thing to detect if echo cancellation is
on? Whats the righ tway to do that?
btw, I have rebuild my zaptel src with "AGGRESSIVE" cancellation
enabled, with MMX enabled and with MARK2 cancellation enabled.
Any advice appreciated!
Thanks,
Don
asterisk1*CLI> zap show channel 8-1
Channel: 8CLI>
File Descriptor: 32
Span: 1
Extension:
Dialing: no
Context: from-pstn
Caller ID string: 520xxxxxxx
Destroy: 0
InAlarm: 0
Signalling Type: PRI Signalling
Owner: <None>
Real: <None>
Callwait: <None>
Threeway: <None>
Confno: -1
Propagated Conference: -1
Real in conference: 0
DSP: no
Relax DTMF: no
Dialing/CallwaitCAS: 0/0
Default law: ulaw
Fax Handled: no
Pulse phone: no
Echo Cancellation: 0 taps unless TDM bridged, currently OFF
PRI Flags:
PRI Logical Span: Implicit
Actual Hookstate: Onhook
asterisk1*CLI>
=== zapata.conf
[channels]
language=en
context=from-pstn
switchtype = national
signalling = pri_cpe
group = 0
channel => 1-8
faxdetect=both
;;echocancel=yes
;;echotraining=yes
;echocancelwhenbridged=yes
echocancel=256
;echotraining=800
=== zaptel.conf
loadzone = us
defaultzone = us
span=1,1,0,esf,b8zs
bchan=1-8
dchan=24
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