Asterisk Support for LUA · Sep 20, 16:34 by Shannon Wynter

After performing a fresh install of Asterisk (1.6) on a new box (decommissioning an old one) I found that it had support for LUA in the dialplan.

Of course, I’ve never used LUA but I know it’s used in some games as the primary scripting engine – which means it must be fast and powerful right? :)

Well, over the course of experimenting with LUA I’ve found that using it to power an Asterisk Dialplan results in some interesting hacks.

Have a look through the code, some of it is incomplete, some of the call_* functions will be enhanced later, but the basics are there

1. configuration = {
2.   area = 7;
3.   country = 61;
4. }
5.  
6. function linenotinuse()
7.   app.wait(1)
8.   app.answer()
9.   app.playback("tt-monkeys")
10.   app.hangup()
11. end
12.  
13. function time()
14.   app.datetime()
15.   app.wait(1)
16.   time()
17. end
18.  
19. -- Eventually some of the call_* functions will become more complicated.
20.  
21. function call_emergency(ctx, ext)
22.   app.dial("SIP/nodephone/" .. ext, 600, 'TWK')
23. end
24.  
25. function call_localrate(ctx, ext)
26.   app.dial("SIP/nodephone/" .. ext, 600, 'TWK')
27. end
28.  
29. function call_freecall(ctx, ext)
30.   app.dial("SIP/nodephone/" .. ext, 600, 'TWK')
31. end
32.  
33. function call_local(ctx, ext)
34.   app.dial("SIP/nodephone/0" .. configuration.area .. ext, 600, 'TWK')
35. end
36.  
37. function call_std(ctx, ext)
38.   app.dial("SIP/nodephone/" .. ext, 600, 'TWK')
39. end
40.  
41. function call_mobile(ctx, ext)
42.   app.dial("SIP/nodephone/" .. ext, 600, 'TWK')
43. end
44.  
45. function call_international(ctx, ext)
46.   app.dial("SIP/nodephone/" .. ext, 600, 'TWK')
47. end
48.  
49. function call_lan(ctx, ext)
50.   app.chanisavail("SIP/" .. ext, "s")
51.   status = channel["AVAILSTATUS"]:get()
52.   app.noop("Status: " .. status)
53.   if status == "4" or status == "5" or status == "20" then
54.     app.playback("pbx-invalid")
55.     return
56.   end
57.   app.dial("SIP/" .. ext)
58. end
59.  
60. -- For incomming calls from nodephone (possibly others)
61. function nodephoneincoming()
62.   -- Make sure both the phones are available
63.   app.chanisavail("SIP/9100&SIP/9101", "s")
64.   status = channel["AVAILSTATUS"]:get()
65.   
66.   -- If both phones appear to be available
67.   if string.find(status, '2', 1, true) == nil and string.find(status, '3', 1, true) == nil and string.find(status, '6', 1, true) == nil then
68.     app.dial("SIP/9100&SIP/9101", 60, 'twk')
69.     dialstatus = channel["DIALSTATUS"]:get()
70.   else
71.     dialstatus = "BUSY"
72.   end
73.  
74.   -- If there was no answer or the line was busy or unavailable, take a message
75.   if not dialstatus == "ANSWER" then
76.     app.noop(dialstatus)
77.     app.goto("takemessage", "s", 1)
78.   end
79. end
80.  
81. -- Prompt up to 3 times to leave a message
82. function takemessage()
83.   if count == nil then count = 0 elseif count < 2 then count = count + 1 else hangup() end
84.   if count == 0 then
85.     app.answer()
86.     app.wait(2)
87.     if dialstatus == "BUSY" then
88.       message = "the-party-you-are-calling&is-curntly-busy"
89.     elseif dialstatus == "CHANUNAVAIL" then
90.       message = "cannot-complete-network-error"
91.     else
92.       message = "away-naughty-boy"
93.     end
94.     message = message .. "&"
95.   else
96.     message = ""
97.   end
98.  
99.   app.background(message .. "T-to-leave-msg&press-star", "", "", "takemessage")
100.  
101.   if not(channel["EXTEN"]:get() == "*") then app.waitexten() end
102. end
103.  
104. function hangup()
105.   app.playback("thank-you-for-calling")
106.   app.playback("goodbye")
107.   app.hangup()
108. end
109.  
110. function voicemail()
111.   app.voicemail("9100@default")
112. end
113.  
114. function voicemailmain()
115.   app.nocdr()
116.   app.voicemailmain()
117. end
118.  
119. extensions = {
120.   -- Context used for message taking - bit of a hack...
121.   takemessage = {
122.     s = takemessage;
123.     t = takemessage;
124.     i = takemessage;
125.     ["*"] = voicemail;
126.   };
127.  
128.   -- Context used to potentially incomming providers
129.   incoming = {
130.     nodephone = nodephoneincoming;
131.     pennytel = linenotinuse;
132.   };
133.  
134.   -- Generally unused context - it's here for voicemail really
135.   default = {
136.     s = linenotinuse;
137.   };
138.  
139.   -- All dialplan for the internal lines
140.   internal = {
141.     -- It doesn't seem the lua code can directly include the parkedcalls context
142.     ["_970X"] = function()
143.       app.goto("parkedcalls", exten, "1")
144.     end;
145.     ["101"] = voicemailmain;
146.     ["102"] = time;
147.     ["000"] = call_emergency;
148.     ["_91XX"] = call_lan;
149.     ["_13ZXXX"] = call_localrate;
150.     ["_1300XXXXXX"] = call_localrate;
151.     ["_1800XXXXXX"] = call_freecall;
152.     ["_NXXXXXXX"] = call_local;
153.     ["_0[2378]XXXXXXXX"] = call_std;
154.     ["_04XXXXXXXX"] = call_mobile;
155.     ["_0011."] = call_international;
156.   };
157. }
158.  
159. Download this code: extensions.lua (Downloaded 26 time(s))

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