[asterisk-users] Zap Bridged Channels

Thu Jul 10 09:15:48 CDT 2008

I've had a similar problem with a A101DX + A202DX. I was trying to bridge from my A101 to my A202 to get faxes over my E1 line. I've done an number of things, I'm not exactly sure which one helped, but it now works very nice for fax:

(1) Using "zap show channel N" on the CLI I noticed that echo canceling was on even those I was bridging two Zap devices. I disabled the HWEC on my A202 card and it's now ok (no echo cancel on the A202 card). This was an option for me because I'm only doing fax on the analog card. I don't think this had a lot to do with the final "fix" of the problem.

(2) I emailed Sangoma and they told me there's a newer version of the drivers that tweek the echo cancel algorithm to make it better suited for fax. The driver was beta at the time so I didn't try it. You might want to contact Sangoma yourself!

(3) I fixed my "zttest" timing! When I tested I had really bad timing (94,00 worst and < 99,00 average). The docs and the wiki say that's bad timing but I had absolutely no problems with voice quality. None! And I've only done one thing to fix my timing: "/etc/init.d/irqbalance restart". I have no idea why that makes a difference but it does and I've now got 99,95 average timing from zttest with the worst being over 99,00. You might want to try this yourself since you also seem to have the "X" (pci express) version of the card.

--

Cosmin Prund

De la: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] În numele Jeremy Mann
Trimis: Wednesday, July 09, 2008 10:28 PM
Către: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subiect: [asterisk-users] Zap Bridged Channels

I have a Sangoma A200DX, and am trying to bridge an FXO channel with FXS for modem connectivity.

I have Zap/8 as a Fax Machine

Zap/5 is my outside line.  When a call rings in on Zap/5 it immediately calls Zap/8 and bridges the channels.  I see it doing a native bridge on the two.  I have echo cancel off on native bridge, but I can never get fax connectivity, it just tries to negotiate forever then eventually hangs up.

Anything special to getting this to work?  

Below is an example of CLI output when the Fax Machine tries to call out, it does the same thing, never get the two machines to complete the call and send the fax.  I've also included the CLI output of channel 5's properties, it does show the EC as off.  I noticed it says "Fax Handled: no", is there something I need to enable in Zapata.conf or zaptel.conf?

Would txgain/rxgain be the issue?

CLI Output ------------------------

    -- Starting simple switch on 'Zap/8-1'

    -- Executing [s at from-zaptel-fax:1] Answer("Zap/8-1", "") in new stack

    -- Executing [s at from-zaptel-fax:2] Dial("Zap/8-1", "Zap/5") in new stack

    -- Called 5

    -- Zap/5-1 is ringing

    -- Zap/5-1 is ringing

    -- Zap/5-1 answered Zap/8-1

    -- Native bridging Zap/8-1 and Zap/5-1

localhost*CLI> zap show channel 5

Channel: 5CLI>

File Descriptor: 27

Span: 2

Extension:

Dialing: no

Context: from-internal-fax

Caller ID:

Calling TON: 0

Caller ID name:

Destroy: 0

InAlarm: 0

Signalling Type: FXO Kewlstart

Radio: 0

Owner: Zap/5-1

Real: Zap/5-1

Callwait: <None>

Threeway: <None>

Confno: -1

Propagated Conference: -1

Real in conference: 0

DSP: yes

Relax DTMF: yes

Dialing/CallwaitCAS: 0/0

Default law: ulaw

Fax Handled: no

Pulse phone: no

Echo Cancellation: 128 taps unless TDM bridged, currently OFF

Master Channel: 8

Actual Confinfo: Num/8, Mode/0x0009

Actual Confmute: No

Hookstate (FXS only): Onhook

Zapata.conf -

[channels]

context=default

usecallerid=yes

hidecallerid=no

callwaiting=yes

usecallingpres=yes

callwaitingcallerid=yes

threewaycalling=yes

transfer=yes

canpark=yes

cancallforward=yes

callreturn=yes

echocancel=yes

echocancelwhenbridged=no

relaxdtmf=yes

rxgain=2.0

txgain=2.0

group=1

callgroup=1

pickupgroup=1

immediate=no

context=from-internal-fax

group=1

signalling = fxo_ks

channel => 5

context=from-zaptel-fax

group=3

signalling = fxs_ks

channel => 8

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