Time-limited calls — revisited

Home » Asterisk Users » Time-limited calls — revisited
Asterisk Users No Comments

I have got time-limited calls with a warning announcement working now …..
almost. Something is going slightly wrong, because the call file that gets
created to trigger the announcement is persisting even after both ends of the
call have hung up.

When a code is dialled, the user enters the context “time-limited-call”. An
announcement is played and the user then dials the number they want to speak
to. The macro “set-1-min-warning” creates a future-timestamped call file
which then uses the “whisper” functionality of ChanSpy() to cause an
announcement to be heard in the phone which originated the call.

Now, I have to admit, this bit I cribbed from somewhere else. As far as I
understand it, a call is set up between extensions “s” and “pbk” in the one-
minute-warning context, which aren’t actually attached to any physical phones;
but extension “pbk” (for playback) starts spying on, and whispering to,
${WARNED_PARTY} — which variable is set within the call file — and so that
extension hears the announcement in the soundfile “ajs-1-minute-warning”,
which gets played to the extension “pbk” when it answers.

I do get the warning being played correctly at 1 minute (I can hear it but
the called party can’t), and the call disconnects once its 2 minutes are up.
But then the call file is not going away even after both parties have hung up
their phones.

I have enclosed relevant snippets from my extensions.conf below. Sound files
are named an such a way as it should be obvious what they do. The ${ANALOGUE}
prefix dials out over the POTS via my TDM410P.

(I just spotted I hardcoded the warning to play after 1 minute rather than
determining it from ARG1. And I guess also I ought to remove unneeded “one
minute warning” call files in a h extension too. But for now, I’m more
concerned with call files persisting unnecessarily)


exten => s,1,NoOp(Getting ready for time-limited call)
exten => s,n,Set(chan=${CUT(CHANNEL(name),-,1)})
exten => s,n,NoOp(Channel name is ${chan})
exten => s,n,Background(ajs-dial-now)
exten => s,n,WaitExten(5)
exten => s,n,Goto(1)

exten => _0XXX.,Macro(set-1-min-warning,${chan},119)
exten => _0XXX.,n,Dial(${ANALOGUE}/${EXTEN},180)
exten => _0XXX.,n,Playback(ss-noservice)
exten => _0XXX.,n,Hangup


exten => s,1,Answer()
exten => s,n,Dial(Local/pbk@four-minute-warning,30,A(ajs-1-min-warning))
exten => s,n,Hangup()

exten => pbk,1,Answer()
exten => pbk,n,ChanSpy(${WARNED_PARTY},qsW)
exten => pbk,n,Hangup()


exten => s,1,NoOp(Getting ready to create a callfile for timed warning on
channel ${ARG1})
exten => s,n,Set(now=${STRFTIME(${EPOCH},,%Y%m%d%H%M.%S)})
exten => s,n,Set(warn_time=${STRFTIME($[${EPOCH} + 60],,%Y%m%d%H%M.%S)})
exten => s,n,NoOp(Right now the time is ${now})
exten => s,n,NoOp(Warning will sound at ${warn_time})
exten => s,n,System(echo -e “Channel:Local/s@one-minute-warningnContext:one-
minute-warningnSetVar: __WARNED_PARTY=${ARG1}nExtension:pbk” >
exten => s,n,System(touch -t ${warn_time} /tmp/warn_${warn_time})
exten => s,n,System(mv /tmp/warn_${warn_time} /var/spool/asterisk/outgoing/)
exten => s,n,Set(TIMEOUT(absolute)=119)