[asterisk-users] How asterisk use pri channel

[Richard Mudgett]

> Extracted from chan_dahdi.c:
> 
> Dial(DAHDI/pseudo[/extension[/options]])
> Dial(DAHDI/<channel#>[c|r<cadance#>|d][/extension[/options]])
> Dial(DAHDI/<subdir>!<channel#>[c|r<cadance#>|d][/extension[/options]])
> Dial(DAHDI/i<span>[/extension[/options]])
> Dial(DAHDI/[i<span>-](g|G|r|R)<group#(0-63)>[c|r<cadance#>|d][/extension[/options]])
> 
> i - ISDN span channel restriction.
> Used by CC to ensure that the CC recall goes out the same span.
> Also to make ISDN channel names dialable when the sequence number
> is stripped off. (Used by DTMF attended transfer feature.)
> 
> g - channel group allocation search forward
> G - channel group allocation search backward
> r - channel group allocation round robin search forward
> R - channel group allocation round robin search backward
> 
> c - Wait for DTMF digit to confirm answer
> r<cadance#> - Set distintive ring cadance number
> d - Force bearer capability for ISDN/SS7 call to digital.
> 
> 
> Where this information can be read, for those of us that don't read C
> source code ?
> Is there "foo show bar" command for that ?

It should be in some dial help but it is not.  The syntax is
channel driver specific and every channel driver has its own needs.
I created that comment block in chan_dahdi.c since I could not find
it elsewhere when studying the code.

Richard