[asterisk-ss7] VÁ: Understanding libss7 code

[Domjan Attila]

On Thu, 2008-12-18 at 15:16 -0600, Matthew Fredrickson wrote:
> 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.
> 
but in this case we will send rel with cause code busy (17), but we are
not busy, I vote in this situation sending rel with normal call
clearing.

p->owner->hangupcause = e->cpg.cause;
p->owner->_softhangup |= AST_SOFTHANGUP_DEV;
p->do_hangup = SS7_HANGUP_DO_NOTHING;
isup_rel(ss7, p->ss7call, AST_CAUSE_NORMAL_CLEARING);



> 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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