[Freeswitch-users] Openzap: Analog FXO disconnect supervision. Is it possible to disconnect on busy? is battery reversal the default? is it power denial?

Anthony Minessale anthony.minessale at gmail.com
Tue Sep 2 11:22:37 PDT 2008 

Any method besides the tone based ones are supported by whichever IO layer
you choose.
For instance if you are using the zt mod (zaptel) then all the low level
analog signalling will be generated by zaptel for ground loop and kewl start
etc.

Tone based hangup detection is a higher level concept that could be
implemented in the core of openzap but would require constant tone detection
throughout the call and is susceptible to false positives etc.

it's not a common feature where I wrote the code from.  I have kewlstart
lines here and nobody has asked for it and I don't have a labbed up example
and I only have 2 hands therefore it's not implemented.

Like I said using tone_detect in FreeSWITCH with action hangup is not any
more or less glorious than how the feature would work right in openzap so
you can use it that way if you want.






On Tue, Sep 2, 2008 at 12:48 PM, Luis F Urrea <lfurrea at gmail.com> wrote:

> Hi Anthony,
>
> Thanks for your response. I find strange that this is not a common feature,
> it's really difficult to get Telcos to answer to magic words such  as
> disconnect supervision.
>
> If tone based disconnect is not used, is "current interrupt" the only
> supported disconnect method on a loopstart line or is it polarity reversal
> supported as well?
>
> Regards,
>
>
> On Tue, Sep 2, 2008 at 9:43 AM, Anthony Minessale <
> anthony.minessale at gmail.com> wrote:
>
>> openzap does not have tone based hangup detection support coded into it.
>> That's why it only works when you use FreeSWITCH to do it in the general
>> dialplan.
>>
>> It's simply a feature we have not had demand for yet in OpenZAP. I'm sure
>> we could add it if we can find the time/resources.
>>
>>
>>
>> On Mon, Sep 1, 2008 at 7:47 PM, Luis F Urrea <lfurrea at gmail.com> wrote:
>>
>>> Hi All,
>>>
>>> I have been working for quite a while in trying to get Openzap to
>>> recognize my country specific busy tone in order to hang up an analog FXO
>>> channel.
>>>
>>> Basically, I am having FXO disconnect supervision issues and I wanted to
>>> know if it's possible to hang up the FXO by monitoring call progress tones
>>> so that when there is a busy tone the FXO goes on hook.
>>>
>>> I have been tweaking the /etc/openzap/tones.conf based on the ITU.T
>>> recommendation E.180 for my country, but so far it doesn't even seem that
>>> the changes I make to the tones.conf file are considered when dealing with
>>> disconnects from the PSTN side.
>>>
>>> I restart FS after every change I make to /etc/openzap/tones.conf with no
>>> positive results.
>>>
>>> The Openzap Wiki states that the "loadzone" parameter in /etc/zaptel.conf
>>> is not considered when dealing with tones, which makes sense since Openzap
>>> seems to use libteletone for tone detection and generation.
>>>
>>> Here is what I use for busy tone on /etc/openzap/tones.conf:
>>>
>>> [us]
>>>
>>> generate-busy => v=-7;%(330,330,450)
>>> detect-busy => 450
>>>
>>> Therefore I set openzap.conf.xml as follows:
>>>
>>>  <param name="tonegroup" value="us"/>
>>>
>>> I was able to check that the busy tone can be detected using the
>>> following dial plan rule:
>>>
>>>    1.      <extension name="Inbound">
>>>    2.            <condition field="destination_number" expression="^1$">
>>>    3.              <action application="answer"/>
>>>    4.              <action application"sleep" data="1000"/>
>>>    5.              <action application="tone_detect" data="busy 450,0 r
>>> +100 hangup normal_clearing"/>
>>>    6.            </condition>
>>>    7.          </extension>
>>>
>>> So that I answer the FXO and hang up when the busy tone is detected. It
>>> works fine and the FXO port does not get stuck.
>>>
>>> Here's the output from the log for the rule above:
>>>
>>> http://pastebin.com/f43500bd3
>>>
>>> I do not see a reason why settings on tones.conf may not be working?
>>>
>>> Is disconnect on busy-detect the default for Openzap? Is it power denial
>>> or battery reversal?
>>>
>>> Does it matter if I select fxsks in /etc/zaptel.conf instead of fxsls?
>>>
>>> Your help will be greatly appreciated.
>>>
>>> Regards,
>>>
>>> Luis
>>>
>>> _______________________________________________
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>>>
>>>
>>
>>
>> --
>> Anthony Minessale II
>>
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-- 
Anthony Minessale II

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ClueCon http://www.cluecon.com/

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