[asterisk-dev] Real-time call control for Dial app

[Kaloyan Kovachev]

Hi,
 it is not necessary that the variables are global - you may set the variable
per channel just before the Dial command and even to clear the value of the
global variable by setting a blank channel variable. This makes it easy to
have 'default rule' and to still be able to customize specific call.
 Also because the global/channel variable is parsed at each run, you may even
have other variables included - like the RAND() function in
http://bugs.digium.com/file_download.php?file_id=13198&type=bug

On Fri, 6 Jul 2007 04:24:59 +0100 (BST), Grey Man wrote
> Hi,
> 
> I need to implement real-time call control within asterisk i.e. rather then
just setting a time limit at the start it needs to be preiodically checked in
case the caller has run out of credit due to simultaneous calls or such.
Thankfully KNK has submitted a patch that does most of the work
http://bugs.digium.com/view.php?id=6335 (without that I'd be struggling). I
have a modified patch working pretty well but have a question regards the way
it can be implemented with the Dial command.
> 
> KNK used some global variables in the dial plan to set the real-time call
control application (or recheck application) however I don't think that's an
ideal way to do it as it will affect every call of the Dial appication and
it's most likely that there will be cases where the check isn't required. As
such I've changed the patch to accept the application as a parameter of the
Dial command along the lines of:
> 
> "    L(x[:y][:z][:rtccapp]) - Limit the call to 'x' ms. Play a warning when
'y' ms are\n"
> "           left. Repeat the warning every 'z' ms. Call real-time call
control applciation 'rtccapp'\n"
> 
> Initially I was thinking:
> 
> L(x[:y][:z][:rtccapp[:rtccfreq]]) where rtccfreq is a period in milliseconds
at which the rtccapp should be called but since the application I will be
using is FastAGI the colon after agi://... made that tricky. The other problem
with having the rtcapp as a parameter is that the first instance of a closing
bracket ) indicates the end of the L options.
> 
> So my question is would anyone have any ideas about a good approach to be
able to use "difficult" strings as parameters? Should there be an option to
enclose a parameter in quotes of some kind and allow them to get passed in
that way?
> 
> The ideal string for what I need is:
> 
>  L(108000:60000:30000:Agi(agi://192.168.1.10:4573?app=rtcc):60000)
> 
> To allow that I'd need to write some custom parameter handling code which
would deviate from the utility methods already in Asterisk and I thought I'd
check here first in case there was a better idea.
> 
> Regards,
> 
> Greyman.
> 
>      
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