System information

A dialplan entry on the pbx.shifteight.org system might look like this:
[unauthenticated]
exten => leif,1,Goto(PublicExtensions,100,1)
exten => jim,1,Goto(PublicExtensions,101,1)
exten => tilghman,1,Goto(PublicExtensions,102,1)
exten => russell,1,Goto(PublicExtensions,103,1)
This is by far the simplest way to implement name dialing, but it is also complex to
maintain, especially in systems with hundreds of users.
In order to implement name handling in a more powerful way, you could add something
like the following to your extensions.conf file. Note that some lines have been wrapped
in this example due to space restrictions. These lines must appear on a single line in
the dialplan. All lines should start with exten =>, same =>, or a comment indicator (;).
[unauthenticated]
exten => _[A-Za-z0-9].,1,Verbose(2,UNAUTHENTICATED REQUEST TO ${EXTEN} FROM
${CALLERID(all)})
same => n,Set(FilteredExtension=${FILTER(A-Za-z0-9,${EXTEN})})
same => n,Set(CheckPublicExtensionResult=${DIALPLAN_EXISTS(PublicExtensions,
${FilteredExtension},1)})
same => n,GotoIf($["${CheckPublicExtensionResult}" = "0"]?CheckEmailLookup)
same => n,Goto(PublicExtensions,${FilteredExtension},1)
; This is our handler for when someone dials a SIP URI with a name
same => n(CheckEmailLookup),GoSub(subEmailToExtensionLookup,start,1
(${TOLOWER(${FilteredExtension})}))
same => n,GotoIf($["${GOSUB_RETVAL}" = "NoResult"]?i,1:PublicExtensions,
${GOSUB_RETVAL},1)
same => n,Goto(i,1)
; This handles invalid numbers/names
exten => i,1,Verbose(2,Incoming call from ${CALLERID(all)} to context ${CONTEXT}
found no result)
same => n,Playback(silence/1&invalid)
same => n,Hangup()
; These are explicit extension matches (useful on small systems)
exten => leif,1,Goto(PublicExtensions,100,1)
exten => jim,1,Goto(PublicExtensions,101,1)
exten => tilghman,1,Goto(PublicExtensions,102,1)
exten => russell,1,Goto(PublicExtensions,103,1)
When a call enters the dialplan, it can match in one of two places: it can match our
pattern match at the top, or it can match the explicit named extensions closer to the
bottom of our example (i.e., leif, jim, tilghman, or russell).
DNS and SIP URIs | 241