[Asterisk-Users] Format of extensions.conf

[Howard Lowndes]

It's also catering for the fact that ${FROM_DID} might be a string with 
embedded spaces, and it's assuming, probably not unreasonably, that 
${CALLERIDNUM} doesn't have embedded spaces.

David Tillman wrote:
> In my (inherited) extensions.conf I have some lines of the format:
> 
>   exten => o,2,GotoIf($["foo${FROM_DID}" =
> "foo"]?from-pstn,s,1:from-pstn,${FROM_DID},1)
> 
> and some lines like:
> 
>   exten => s,1,GotoIf($[foo${ECID${CALLERIDNUM}} = foo]?4)
> 
> 
> Note the quotes around the "foo${FROM_DID}" and "foo" in the
> first, but the lack of quotes in the second.
> 
> Are these syntacticly equivalent?
> 
> In the first, is it just comparing to see if the string "foo" still equals
> "foo" after the vars are interpolated?
> 
> Thanks,
> -dave
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Howard.
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