Asterisk Hangup Handler using lua - lua

Question

I am trying to Add a hangup handler in my dial plan to catch unanswered calls from dial with multiple extensions. But unfortunately I my hangup handlers are not executing at all.
Below is my extensions.lua
CONSOLE = "Console/dsp" -- Console interface for demo
IAXINFO = "guest" -- IAXtel username/password
TRUNK = "SIP"
GSMTRUNK = "Dongle/dongle0/"
PRITRUNK = "DAHDI/g0/"
TRUNKMSD = 1
local inspect = require ('inspect')
--from here onwards our logic is there Rajesh
function dialtomobind(number)
app.Dial(GSMTRUNK..number, 50,'egb(add-hangup-handler^'..number..'^1)')
local dialstatus = channel['DIALSTATUS']:get()
app.NoOp('DIAL STATUS:'..dialstatus)
app.Hangup(16)
end
function add_hangup_handler(context, extension)
channel['hangup_handler_push']='hangup-handlers,s,1'
app.NoOp('pre-dial handler, Adding Hangup Handler'..channel['hangup_handler_push']:get())
app.Return()
end
function h_handler(context, extension)
app.NoOp('After Hangup:'..extension)
--app.DumpChan(3)
end
function directdialing(c,e)
app.Answer(5)
app.Playback('tt-monkeys')
dialtomobind(string.sub(e, 4))
app.Hangup(16)
end
function hangup_handler_1(c,e)
--channel['hangup_handler_push']
app.NoOp('Hangup Handler 1 Executed')
app.Return()
end
extensions = {
['from-internal-sip']={
['h']=h_handler;
['_500XXXXXXXXXX']=directdialing;
};
['dongle_incoming']={
['_.']=gsm_dongle_handler;
};
['add-hangup-handler']={
['_.']=add_hangup_handler;
};
['hangup-handlers']={
['_.']=hangup_handler_1;
};
}
ASTERISK CLI OUT PUT:
-- Executing [5008884882772#from-internal-sip:1] Answer("SIP/8884882772-00000047", "5")
> 0x7f14c80072a0 -- Probation passed - setting RTP source address to 192.168.2.30:54032
[Aug 29 18:24:17] NOTICE[26470][C-000000c5]: res_rtp_asterisk.c:4478 ast_rtp_read: Unknown RTP codec 95 received from '192.168.2.30:54032'
-- Executing [5008884882772#from-internal-sip:1] Playback("SIP/8884882772-00000047", "tt-monkeys")
-- <SIP/8884882772-00000047> Playing 'tt-monkeys.gsm' (language 'en')
-- Executing [5008884882772#from-internal-sip:1] Dial("SIP/8884882772-00000047", "Dongle/dongle0/8884882772,50,egb(add-hangup-handler^8884882772^1)")
-- Dongle/dongle0-010000000e Internal Gosub(add-hangup-handler,8884882772,1) start
-- Executing [8884882772#add-hangup-handler:1] NoOp("Dongle/dongle0-010000000e", "pre-dial handler, Adding Hangup Handlerhangup-handlers,s,1")
-- Executing [8884882772#add-hangup-handler:1] Return("Dongle/dongle0-010000000e", "")
== Spawn extension (dongle_incoming, 5008884882772, 1) exited non-zero on 'Dongle/dongle0-010000000e'
-- Dongle/dongle0-010000000e Internal Gosub(add-hangup-handler,8884882772,1) complete GOSUB_RETVAL=
-- Called Dongle/dongle0/8884882772
-- Dongle/dongle0-010000000e is making progress passing it to SIP/8884882772-00000047
== Spawn extension (from-internal-sip, 5008884882772, 1) exited non-zero on 'SIP/8884882772-00000047'
-- Executing [h#from-internal-sip:1] NoOp("SIP/8884882772-00000047", "After Hangup:h")

Answer 1

Hangup handler is dialplan handler.
So if you want use it, start OTHER lua script at submited context/extension on hangup.
Extension hangup-handlers,s,1 have be valid and exist.
You have use
app.Set('CHANNEL(hangup_handler)=hangup-handlers,s,1');
becuase it is not variable, it is function.

Answer 2

hangup_handler_push is not at all a channel variable. So Can't access using below methods.
channel['hangup_handler_push']='hangup-handlers,s,1'
or
channel['hangup_handler_push']='hangup-handlers,s,1'
To setup a hangup handler we have to use dial plan function CHANNEL(https://wiki.asterisk.org/wiki/display/AST/Hangup+Handlers). So below methods will be working.
channel.CHANNEL('hangup_handler_push'):set('hangup-handlers,s,1')
As Asterisk Set Application Can be used to set a channel Variables as well as can call a asterisk Functions also. So below code also working.
app.Set('CHANNEL(hangup_handler)=hangup-handlers,s,1');
Reference:
Dial Plan Functions In Lua
https://wiki.asterisk.org/wiki/pages/viewpage.action?pageId=16548029