asterisk users - Feb 2020 - Hangup hook to put back a call into a queue

hi,
I hope someone can help me:-)
we’ve got a freepbx server. there are 2 special extensions (2001, 2002). 
if someone calls this extensions (or a call is forwarded to these 
extensions) and these extension hangup (not the caller party), then we’d 
like to put the calls back into a queue (1000) and wouldn’t like to hangup.

I read your description about hangup hooks:
https://community.freepbx.org/t/hooking-for-fun-and-income/57718

but still not able to implement it:-(
what I’ve done:
* found out in a hard way how to detect the current destination 
extension (because it’s turn out that CALLERID(dnid) is not working in 
case of forwarded call it’s show the original destination)
* write a macro-dialout-one-predial-hook and a hook marco like this:

[macro-dialout-one-predial-hook]
exten => s,1,Noop(Entering user defined context 
macro-dialout-one-predial-hook in extensions_custom.conf)
exten => s,n,GotoIf($["${DEXTEN}"=“2001”]?special)
exten => s,n,GotoIf($["${DEXTEN}"=“2002”]?special)
exten => s,n,MacroExit
exten => s,n(special),NoOp(--------------- Push Special Hangup Handler 
------------------)
exten => s,n,Set(CHANNEL(hangup_handler_push)=back-to-1000-hangup,s,1)
exten => s,n,MacroExit

[back-to-1000-hangup]
exten => s,1,Noop(====== Entering user defined context 
back-to-1000-hangup =======)
exten => s,n,Queue(1000)
exten => s,n,Return

it seems to be called and seem to enter into to call but immediately hangup.
first of all, in this case when in the hangup handler I will NOT like to 
hangup how should I finish the marco?:

Hangup
Return
MacroExit
how to redirect the call to the queue?:

Queue(1000)
ChannelRedirect(${CHANNEL},,1000,1)
Gosub(ext-intercom,*801000,1())
dial-one,HhTtrM(auto-blkvm),1000
and what is the reason I can’t put the call back to the queue?
I know that I'm already in the hangup sequence, but still wouldn't like 
to hangup.
or this can't be done in the hangup handler?

thank you for your help in advance.

regards.
-- 
   Levente                               "Si vis pacem para bellum!"

On Wed, Feb 5, 2020 at 12:34 PM Farkas Levente <lfarkas at lfarkas.org>
wrote:
> hi,
> I hope someone can help me:-)
> we’ve got a freepbx server. there are 2 special extensions (2001, 2002).
> if someone calls this extensions (or a call is forwarded to these
> extensions) and these extension hangup (not the caller party), then we’d
> like to put the calls back into a queue (1000) and wouldn’t like to hangup.
>
> I read your description about hangup hooks:
> https://community.freepbx.org/t/hooking-for-fun-and-income/57718
>
> but still not able to implement it:-(
> what I’ve done:
> * found out in a hard way how to detect the current destination
> extension (because it’s turn out that CALLERID(dnid) is not working in
> case of forwarded call it’s show the original destination)
> * write a macro-dialout-one-predial-hook and a hook marco like this:
>
> [macro-dialout-one-predial-hook]
> exten => s,1,Noop(Entering user defined context
> macro-dialout-one-predial-hook in extensions_custom.conf)
> exten => s,n,GotoIf($["${DEXTEN}"=“2001”]?special)
> exten => s,n,GotoIf($["${DEXTEN}"=“2002”]?special)
> exten => s,n,MacroExit
> exten => s,n(special),NoOp(--------------- Push Special Hangup Handler
> ------------------)
> exten => s,n,Set(CHANNEL(hangup_handler_push)=back-to-1000-hangup,s,1)
> exten => s,n,MacroExit
>
> [back-to-1000-hangup]
> exten => s,1,Noop(====== Entering user defined context
> back-to-1000-hangup =======)
> exten => s,n,Queue(1000)
> exten => s,n,Return
>
> it seems to be called and seem to enter into to call but immediately
> hangup.
> first of all, in this case when in the hangup handler I will NOT like to
> hangup how should I finish the marco?:
>
Hangup handlers don't allow you any control over the hangup process. You
can't stop it from occurring and in fact when it occurs the channel is
already hung up. Anything that expects a live channel won't work.

> Hangup
> Return
> MacroExit
> how to redirect the call to the queue?:
>
> Queue(1000)
> ChannelRedirect(${CHANNEL},,1000,1)
> Gosub(ext-intercom,*801000,1())
> dial-one,HhTtrM(auto-blkvm),1000
> and what is the reason I can’t put the call back to the queue?
> I know that I'm already in the hangup sequence, but still wouldn't
like
> to hangup.
> or this can't be done in the hangup handler?
>
You can't do it from a hangup handler. The Dial option provides the g
option[1] which can be used to continue dialplan execution when the called
party hangs up, but I don't work on FreePBX so I can't comment on how
best
to use it there.

[1] https://wiki.asterisk.org/wiki/display/AST/Asterisk+16+Application_Dial

-- 
Joshua C. Colp
Asterisk Technical Lead
Sangoma Technologies
Check us out at www.sangoma.com and www.asterisk.org
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