[asterisk-dev] LibPRI

[Konrad Endruszkiewicz]

Thank you, that huge hint.

> On Jun 1, 2017, at 00:15, Matt Fredrickson <creslin at digium.com> wrote:
> 
> On Tue, May 23, 2017 at 12:43 PM, Konrad Endruszkiewicz
> <konradend at gmail.com <mailto:konradend at gmail.com>> wrote:
>> Hi,
>> 
>> thanks for info. I will have a look on this sig_pri.c from Asterisk code.
>> Right now I'm struggling with the issue of handling situation, when
>> the app is getting RING event, the call is answered, but when by the
>> network issues, the call is cut off, then I don't get the HANG UP
>> event and the app is still considering that call is active.
>> The card is using Unnumbered frame event, when this kind of event
>> occurs, where subtype is set to SABME (set asynchronous balanced mode
>> extended).
>> 
>> But libpri seems not have the direct way to handle this event (or I
>> cannot find how to capture this).
>> Maybe you have any idea how to approach this?
> 
> Sorry about the delayed response, I was on vacation last week and
> didn't check my email :-)
> 
> There is a timer, T309, that is used to allow calls to remain
> connected for some period of time after layer 2 (Q.921) has a
> disconnect event or drop out of some sort.  Typically, this is a layer
> 2 timeout condition, where a SABME or other layer 2 message doesn't
> receive a response within T200 seconds (usually 1 second).  At this
> point, T309 is started (usually 6 seconds) and gives layer 2 the
> chance to recover.  If layer 2 does not recover within T309's timeout,
> all calls that are active receive a disconnect notification and I
> believe you should receive HANGUP events on them as well.
> 
> Hope that helps,
> Matthew Fredrickson
> 
>> 
>> Best regards,
>> ______________________________________________
>> 
>> Konrad End
>> 
>> 
>> 2017-05-23 19:27 GMT+04:00 Matt Fredrickson <creslin at digium.com>:
>>> On Tue, May 23, 2017 at 5:06 AM, Konrad Endruszkiewicz
>>> <konradend at gmail.com> wrote:
>>>> Hi,
>>>> 
>>>> I looking for documentation for LibPRI 1.6 or any samples where this
>>>> library is used.
>>>> I need to build a software on top of this library to support big callcenter.
>>> 
>>> Hi Konrad,
>>> 
>>> Libpri is a library that runs on top of a DAHDI channel that operates
>>> in HDLC mode.  It assumes that the HDLC encoding/decoding as well as
>>> CRC generation/checking occurs at lower layers - typically the dahdi
>>> layer.  It implements an abstraction over the Q.921 and Q.931 layers
>>> that is easier to use and understand that dealing with messages
>>> directly.
>>> 
>>> The best place to look for an example with high use is that used in
>>> chan_dahdi.c (more specifically, sig_pri.c) in the Asterisk source
>>> code.  There are one or two test applications in the libpri repo that
>>> can be seen as simpler implementations, but I can't remember if they
>>> still work or not (testprilib.c and pritest.c, IIRC).
>>> 
>>> Hope that helps!
>>> 
>>> --
>>> Matthew Fredrickson
>>> Digium, Inc. | Engineering Manager
>>> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
>>> 
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> 
> 
> 
> -- 
> Matthew Fredrickson
> Digium, Inc. | Engineering Manager
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> 
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