[asterisk-ss7] VÁ: Understanding libss7 code

[Matthew Fredrickson]

Domjan Attila wrote:
> should put in chan_dahdi after ISUP_EVENT_CPG and I think have to parse
> and pass this busy attribute to chan_dahdi via event_cpg.
> How looks like this kind of CPG?

I would dare say that it would probably be best to not even explicitly 
send an REL at that point, just set the SOFTHANGUP flag on the 
ast_channel so that Asterisk will initiate the hangup at that point.

That is how it is done in libpri in a similar scenario, if you look at 
PRI_EVENT_PROGRESS handling code in chan_dahdi.c. (IIRC)

Matthew Fredrickson
Digium, Inc.

> 
> On Thu, 2008-12-18 at 11:56 -0800, Rana Dhekial wrote:
>> I am not sure whether ITU ANSI standrad calls for it. But in real life
>> I am having following probelm.
>>  
>>  
>> A SIP phone registered with Asterisk calls a Mobile  subscriber 
>>  
>> Asterisk  ---------IAM------------>PSTN  ( Mobile subscriber )
>>  
>> Asterisk <--------ACM--------------PSTN  
>>  
>> The SIP phone hears the ring back tone
>>  
>> The Mobile subscriber rejects the call by pressing the release button.
>> In this part of the world,  call  does not get forwarded to Mobile
>> subscriber's voice mail. Probably incumbennt PLMN does not have voice
>> mail service. Instead PSTN sends CPG with user busy.
>>  
>> Asterisk <----CPG ( with user busy)----PSTN
>>  
>>  
>> The SIP phone keeps hearing the ring back tone for 60-90 seconds and
>> finally the PSTN sends RELEASE after 60-90 seconds. 
>>  
>>  
>> Asterisk <------REL-------------------PSTN
>>  
>> Asterisk --------RLC ----------------->PSTN
>>  
>>  
>> My idea is to cut this 60-90 seconds to 0 by sending REL to PSTN
>> immediately after getting the CPG with user busy from PSTN.  I have
>> tried talking to PSTN to send RELEASE to Asterisk right after they
>> send CPG with user busy but  has been invain. 
>>  
>> So any help with the code will be appreciated.
>>  
>> thanks,
>>  
>>
>>
>>> From: adomjan at tvnet.hu
>>> To: asterisk-ss7 at lists.digium.com
>>> Date: Thu, 18 Dec 2008 09:02:08 +0100
>>> Subject: [asterisk-ss7] VÁ: Understanding libss7 code
>>>
>>> The code is very readable, I red the all :)
>>> where is in the itu/ansi standard that we have to do it?
>>>
>>> -- eredeti üzenet --
>>> Tárgy: [asterisk-ss7] Understanding libss7 code
>>> Feladó: Rana Dhekial <dhekial at msn.com>
>>> Dátum: 2008.12.18. 01:27
>>>
>>>
>>> Hi Matthew,
>>>
>>>
>>> Can you point me to some documentations to understand the libss7
>> source code and how it is linked with Asterisk? I have been struggling
>> to modify your code to send ISUP_RELEASE on getting CPG with user busy
>> from PSTN but has been successful yet.
>>> thanks,
>>>
>>> Rana
>>>
>>>
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