Directory( ) Provides a dialable directory of extensions
Directory(vm-context[,dial-context[,options]])
Presents users with a directory of extensions from which they may select by name. The list of names and extensions is discovered from voicemail.conf. The vm-context argument is required; it specifies the context of voicemail.conf to use.
The dial-context argument is the context to use for dialing the users, and it defaults to vm-context if unspecified. Currently, the only option that can be specified in the options argument is f, which causes the directory to match based on the first name in voicemail.conf instead of the last name.
If the user enters 0 (zero) and there exists an extension o (the lowercase letter o) in the current context, the call control will go to that extension. Entering * will exit similarly, but to the a extension, much like Voicemail( )'s behavior.
Returns 0 unless the user hangs up.
exten => *,1,Directory(default,incoming)
exten => #,1,Directory(default,incoming,f)