Dialplan to Lua Reference

Below is a quick reference that can be used to translate traditional extensions.conf dialplan concepts to their analog in extensions.lua.

Extension Patterns¶

Extension pattern matching syntax on logic works the same for extensions.conf and extensions.lua.

50%

extensions.conf¶

[users]
exten => _1XX,1,Dial(SIP/${EXTEN})

exten => _2XX,1,Voicemail(${EXTEN:1})

50%

extensions.lua¶

extensions = {}
extensions.users = {}

extensions.users["_1XX"] = function(c, e)
 app.dial("SIP/" .. e)
end

extensions.users["_2XX"] = function(c, e)
 app.voicemail("1" .. e:sub(2))
end

Context Includes¶

50%

extensions.conf¶

[users]
exten => 100,1,Noop
exten => 100,n,Dial("SIP/100")

[demo]
exten => s,1,Noop
exten => s,n,Playback(demo-congrats)

[default]
include => demo
include => users

50%

extensions.lua¶

extensions = {
 users = {
 [100] = function()
 app.dial("SIP/100")
 end;
 };

 demo = {
 ["s"] = function()
 app.playback(demo-congrats)
 end;
 };

 default = {
 include = {"demo", "users"};
 };
}

Loops¶

50%

extensions.conf¶

exten => 100,1,Noop
exten => 100,n,Set(i=0)
exten => 100,n,While($[i < 10])
exten => 100,n,Verbose(i = ${i})
exten => 100,n,EndWhile

50%

extensions.lua¶

i = 0
while i < 10 do
 app.verbose("i = " .. i)
end

Variables¶

50%

extensions.conf¶

exten => 100,1,Set(my_variable=my_value)
exten => 100,n,Verbose(my_variable = ${my_variable})

50%

extensions.lua¶

channel.my_variable = "my_value"
app.verbose("my_variable = " .. channel.my_variable:get())

Applications¶

50%

extensions.conf¶

exten => 100,1,Dial("SIP/100",,m)

50%

extensions.lua¶

app.dial("SIP/100", nil, "m")

Macros/GoSub¶

Macros can be defined in pbx_lua by naming a context 'macro-*' just as in extensions.conf, but generally where you would use macros or gosub in extensions.conf you would simply use a function in lua.

50%

extensions.conf¶

[macro-dial]
exten => s,1,Noop
exten => s,n,Dial(${ARG1})

[default]
exten => 100,1,Macro(dial,SIP/100)

50%

extensions.lua¶

extensions = {}
extensions.default = {}

function dial(resource)
 app.dial(resource)
end

extensions.default[100] = function()
 dial("SIP/100")
end

Goto¶

While Goto is an extenstions.conf staple, it should generally be avoided in pbx_lua in favor of functions.

50%

extensions.conf¶

[default]
exten => 100,1,Goto(102,1)

exten => 102,1,Playback("demo-thanks")
exten => 102,n,Hangup

50%

extensions.lua¶

extensions = {}
extensions.default = {}

function do_hangup()
 app.playback("demo-thanks")
 app.hangup()
end

extensions.default[100] = function()
 do_hangup()
end

The app.goto() function will not work as expected in pbx_lua in Asterisk 1.8. If you must use app.goto() you must manually return control back to asterisk using return from the dialplan extension function, otherwise execution will continue after the call to app.goto(). Calls to app.goto() should work as expected in Asterisk 10 but still should not be necessary in most cases.

In Asterisk 1.8, use return

function extension_function(c, e)
 return app.goto("default", "100", 1)

 -- without that 'return' the rest of the function would execute normally
 app.verbose("Did you forget to use 'return'?")
end




---