Hi all, 

Is a way to force Asterisk to send DSS1 PROGRESS message to PSTN with 
indicator: "Inband information now available", before call is established (even 
before ALERTING phase)? 
I also think that this indicator can be contained in CALL PROCEEDING message. 

My idea is to play not billed welcome message on Asterisk system. Just now 
there is incoming SETUP, Asterisk replies with CALL PROCEEDING (without 
indicator I presume - but I can think only from Asterisk trace, no ISDN tester 
available at the moment). In ideal case there should be send PROGRESS or CALL 
PROCEEDING message with that indicator. 

How to setup this (for PRI and junghanns.net BRI)? 

=== 
exten => 222000262,1,Playback(welcome,noanswer) 
;At this moment would like to send PROGRESS with "Inband info now av." 
exten => 222000262,2,Dial(....) 


Used version is 1.2.4-Bristuffed at the moment. 

Thank you. 
Michal 

P.S. I know this is supported only by some telcos, not all, but at the moment 
would like to cover Asterisk side of the problem.
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