[asterisk-users] ISDN incoming call - inband info and announcements BEFORE ANSWER

[Matthew Fredrickson]

On Aug 1, 2006, at 3:13 PM, Michal Doležel wrote:
> 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)?
>

Use the Progress() application in your dialplan before you Answer() the 
line.  Use the Background() application with the 'n' flag to play your 
announcement (so the line is not Answer()'d automatically for you).

Matthew Fredrickson