[Freeswitch-users] openzap and progress detection

Anthony Minessale anthony.minessale at gmail.com
Wed May 20 06:08:23 PDT 2009

The most difficult one would be the cadence detection.
The rest are just based on events from the driver.  We have never tried it
in Spain so we unfortunately have not had
a working environment to test it in.  I am sure we could strive to support
your requests but it will take time and resources
so maybe you can open a feature request on jira
http://jira.freeswitch.organd we can try to keep track of your

On Wed, May 20, 2009 at 5:26 AM, François Delawarde <
fdelawarde at wirelessmundi.com> wrote:

>  I briefly looked at the code, so I will then answer my own questions from
> what i understood (and I didn't understand much). Please correct me if I'm
> wrong (see inline answers).
> A new question would then be: Are any of those features planned for the
> future of OpenZAP?
> On Mon, 2009-05-18 at 10:29 +0200, Francois Delawarde wrote:
> Hello,
> I'm in Spain with an analog TDM400 Clone from OpenVox (with 1xFXO+1xFXS),
> and am trying first to make the FXO work with Openzap and Freeswitch (using
> dahdi 2.2.0-rc4). Openzap perfectly detects and loads the spans, but I'm
> currently enable to dial out with the FXO module, it doesn't dial anything
> and times-out after 30 seconds.  I believe it has to do with some tone
> detection and  therefore have a few questions:
> - When I plug in the line, dahdi sends an event (event 17) that is ignored
> by OZ. Can we enable some type of battery check in OZ before dialing out, or
> is there some variable to monitor battery (oz dump doesn't show the battery
> status)?
> No.
>  - Does OZ use the polarity switch events sent by dahdi (in kewlstart mode)
> for answer and hangup detection?
> Yes.
>  - Apparently, OZ does tone progress detection by frequency, but here in
> Spain, most tones use the same 425Hz frequency with different on-off timing.
> Is it possible to detect those?
> No.
>  - As some PBX in Spain transfer calls by first hanging up and picking up
> on another phone, can we enable/disable parts of polarity switch and/or tone
> progress detection (ex: (hangup)/(answer)onpolarityswitch in Asterisk)
> No.
>  - Some lines here are connected to very old FXS from operators that have
> low sound quality and can take a few seconds to give a dial tone when
> picking up. Is it possible to introduce a delay before sending DTMF digits
> when dialing? Is it possible to "relax" DTMF detection, and tweak DTMF
> settings (make them a bit longer, with a longer pause for the other side to
> detect)?
> No / No idea / No idea
>  My "ideal" case to make it work in every case around here would be to:
> - have OZ fail to dial if battery is not present (and be able to fetch
> battery status somehow)
> - disable tone progress (sometimes call ends up on some local PBX that
> answers and provides US tones which are different)
> - be able to have an initial pause before dialing with DTMF digits
> - use polarity switch to detect remote answer, but not hangup (for transfer
> issues)
> Is the above possible?
> No.
>  Thanks in advance,
> François.
> You're welcome!
> François.
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Anthony Minessale II

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