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Extensions are routed according to priority, and may be based on any set
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of digits, #, and *. For each extension, several actions may be listed
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and each given a priority. When each action completes, it generally moves
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to the next priority (except for some modules which use explicity GOTO's.
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Extensions frequently have data they pass to the executing application
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(most frequently a string). There are some reserved application names:
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GoTo: Go to a specific extension
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Answer: Answer the line, if it hasn't already been answered
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Also, there are some extensions with important meanings:
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s: What to do when an extension context is entered (unless
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overridden by the low level channel interface)
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i: What to do if an invalid extension is entered
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t: What to do if nothing is entered in the requisite amount
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And finally, the extension context "default" is used when either a) an
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extension context is deleted while an extension is in use, or b) a specific
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starting extension handler has not been defined (unless overrridden by the
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low level channel interface).
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doc/extensions.txt
