[asterisk-users] weird undocumented extensions such as s-BUSY

[Eric "ManxPower" Wieling]

Barzilai Spinak wrote:
> I've seen several examples that use extensions such as;
> s-BUSY
> s-NOANSWER
> 
> etc...
> 
> It's more or less evident what they do, but I've searched for some 
> FORMAL documentation everywhere and have found nothing.
> Do they work for anything else than "s-"? (I think I've seen other 
> examples, but can't find them now)
> Are they standard in any way?
> What are the allowed values after the dash?
> In which version were they introduced?
> etc...
> 
> (please no replies explaining me how "s-BUSY" matches when the start 
> extension is set busy or trivial explanations like that)

Try looking in extensions.conf.sample