[Asterisk-Users] How to ensure that software echo cancellation ison?

[Don Murray]

Hey, Anton,

At least you get the Hookstate to be "offhook".  On my T1 I've never 
managed to see a hookstate as anything other than "onhook" (as seen in 
my zap show channel result below a few posts).  And yet, the caller id 
number is displayed, so this channel really does seem to be connected to 
someone.  I notice our formats are a little different. Mine saying 
"Actual Hookstate" and yours saying "Hookstate (FXS only)".

I hate to have that tone of desperation creep into my posts but... I was 
really hoping of taking the system offline sporadically over the 
weekend, so any advice today would be doubly appreciated.

For those who haven't read all the below the issues are:
1) how to verify that echo cancellation is on
2) if my echo cancellation is really off, what am I doing wrong to 
activate it

Don


Anton Krall wrote:

>Hehehe then something is weird with mine :=
>
>I have this
>
>Zapata.conf
>
>
>echocancel=yes
>echocancelwhenbridged=yes
>echotraining=yes
>echotraining=800
>
>And now:
>
>voip*CLI> zap show channel 1
>Channel: 1
>File Descriptor: 18
>Span: 1
>Extension:
>Dialing: no
>Context: casa
>Caller ID:
>Calling TON: 0
>Caller ID name:
>Destroy: 0
>InAlarm: 0
>Signalling Type: FXS Kewlstart
>Radio: 0
>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: 128 taps, currently OFF
>Actual Confinfo: Num/0, Mode/0x0000
>Actual Confmute: No
>Hookstate (FXS only): Offhook
>
>Mine says its off too..... Anything wrong?
>Also, says fax handled no.. What does that mean? Has anything to do with:
>
>faxdetect=both
>faxdetect=incoming
>faxdetect=outgoing
>faxdetect=yes
>
>?????? 
>
>|-----Original Message-----
>|From: asterisk-users-bounces at lists.digium.com 
>|[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
>|jjones at quiddesign.com
>|Sent: Jueves, 02 de Junio de 2005 05:00 p.m.
>|To: Asterisk Users Mailing List - Non-Commercial Discussion
>|Subject: Re: [Asterisk-Users] How to ensure that software echo 
>|cancellation ison?
>|
>|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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>|
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