[asterisk-dev] proper way to signal user information layer 1 (ISDN)

[Kaloyan Kovachev]

On Fri, 14 Sep 2007 15:24:59 +0200, Klaus Darilion wrote
> Hi!
> 
> In case of digital ISDN calls I want to signal the ISDN user information 
> layer 1 values between the dialplan (and maybe some apps) and the ISDN 
> channel driver.
> 
> I see two ways of doing this:
> 
> 1. an ast_variable (a global one with _ prefix so that it gets copied 
> automatically) which is read/written by the ISDN channel drivers and the 
> apps.
> 
> 2. Adding ast_channel.userinformationlayer1. The channel driver and apps 
> can access the value directly and from dialplan this can be done by 
> enhancing func_channel.c (http://bugs.digium.com/view.php?id=10217)
> 
What about adding a channel specific information section to ast_channel? Now
there are SIPCHANINFO and IAXCHANINFO functions, so should there be
ISDNCHANINFO and friends or a common function CHANINFO which returns the
channel specific info for the current technology from that section?

> This value exists only in ISDN, thus I'm not sure if a new member to 
> ast_call is the proper way - but ISDN transfer capability is similar and 
> this is already added to ast_chan.
> 
> thanks
> klaus
> 
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