[asterisk-users] Answered time on channel

Eric Wieling ewieling at nyigc.com
Tue Dec 26 15:40:44 CST 2017

Don't use an 'h' extension, use a hangup handler.
Use the MASTER_CHANNEL() function to set variables to ensure they are 
always set in the "top most" channel.  Below is an untested example, but 
is inspired by dialplan code I use in production.  Maybe it will help.

[outbound] ; this is called on the incoming (caller) channel
exten => _X.,1,Noop
  same => n,Set(MASTER_CHANNEL(start_timestamp)=${STRFTIME(,,%s.%3q)})
  same => n,Set(CHANNEL(hangup_handler_push)=hangup_handler,s,1)
  same => n,Set(MASTER_CHANNEL(callid_ingress)=${SIPCALLID})
same => n, *** unrelated dialplan, AGIs, etc. ***
  same => n,Dial(SIP/${EXTEN}@ 
<mailto:EXTEN%7D at>,,U(answer_handler)b(pre_dial_handler^s^1)g
  same => n, *** dialplan for the caller when the callee hangs up first, 
not run when caller hangs up first.  use it to try dialing another 
destination, play intercept to caller, etc. ***

[pre_dial_handler] ; this is called on the outgoing (callee) channel
exten => s,1,Noop
  same => n,Set(MASTER_CHANNEL(callid_egress)=${SIPCALLID})
  same => n,Set(MASTER_CHANNEL(dial_timestamp)=${STRFTIME(,,%s.%3q)})
  same => n,Return

[answer_handler] ; run on outgoing (callee) channel, but sets 
answer_timestamp in the caller channel
exten => s,1,Noop
  same => n,Set(MASTER_CHANNEL(answer_timestamp)=${STRFTIME(,,%s.%3q)})
  same => n,Return

[hangup_handler]  ; run on incoming (caller) channel, use to do final 
post call cleanup
exten => s,1,Noop
same => n,Set(MASTER_CHANNEL(hangup_timestamp)=${STRFTIME(,,%s.%3q)})
   same => n, ***post call cleanup AGIs, dialplan, etc.***
same => n,Return

On 12/26/2017 03:28 PM, Dovid Bender wrote:
> Hi,
> I have a dial plan where I need to notify an external system when a 
> call was answered and when the call hung up. In both requests the 
> start time needs to be the same. My Dialplan looks something like this:
> [outbound]
> Exten => _X.,1,Dial(SIP/${EXTEN}@ 
> <mailto:EXTEN%7D at>,,U(call-answer-from-carrier))
> [call-answer-from-carrier]
> Exten => s,1,Noop(CALL WAS ANSWERED AT ${EPOCH}
> Exten => s,n,Agi(some_script.py)
> Now in theory the hangup time of the call (${EPOCH} in the h 
> extension) minus the answered time should be the same as the noop from 
> my subroutine. I am finding that some times they match and some times 
> they are off by a second. My issue is that the external system expects 
> the answered time to the same for when we call it from the SubRoutine 
> as well as from the h extension. I assume the difference is based on 
> the microsecond of when we look at EPOCH how DIALEDTIME is rounded.
> Any tips on how I can get the same answered time across the board?
> TIA.
> Dovid

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