You are right about placement of the underscore, it's the proper way.
As for loop detection, I think something was just added to the development version within
the last few weeks.
Andrew Lindh wrote:
This seems like a user-list question, but it's not...at least not all of it.
Issue #1:
I was working with the DIALSTATUS variable in the extension plan using the line after a dial: exten => s,n,Goto(s-${DIALSTATUS},1)
I then have a normal line that works like: exten => s-BUSY,1,Busy()
Then a match for all other dialstaus: exten => s-.,1,Congestion()
But it does not work! No supprise I look at and agree that it should not work because it should be: exten => _s-.,1,Congestion()
Without the underline it should only do exact matches. I looked at all the documentation and it all lists it WITHOUT the underline and says that "s-." would be a catchall for the dialstatus goto, but it does not work. Am I missing something here? The docs say that's what to use, but it does not work and should not work with out the underline.
Issue #2:
I also made a small config mistake and saw that there does not seem to be any loop detection with the goto. This could be a problem for a misconfigured system (not that certified experts should ever have that problem). A goal of a well programmed application is to protect users from their own mistakes.
Simple example: [oops] exten => s,1,Goto(s,1)
Not a good example (what fool would do that!), but you get the idea. There should be something in place to catch endless loops. May be something as simple as a count of how many commands (exten matches) or goto's a call can have before it is disconnected (or sent to the T extension). Sendmail programs do this now, it allows 30 hops before failing a message. A fixed number is not good because we can't know what everyone will do but a high default (100 or so) as a hard limit would break loops without doing true loop detection. It could just be "maxmatchcount=100" in the [general] section.
-- Andrew
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