asterisk users - Nov 2018 - Disposition ANSWERED but duration, billsec=0 [SEC=UNCLASSIFIED]

Hi Asterisk-users,

I have a bit of a hairy one for you.. that is driving me absolutely nuts to be
frank.

We have an issue where our CDR records are being recorded with a zero
billsec/duration on particular call cases, but not all.

See below CDR for "internal" (locally routed) call, with correct
billsec/durations (dialled numbers X'd for privacy):
mysql> select * from cdr where id = '4352614'\G
*************************** 1. row ***************************
   calldate: 2018-11-02 03:02:24
       clid: "Red Shed" <XXXX>
        src: XXXX
        dst: XXXX
   dcontext: ringext
    channel: SIP/6886A7C5F3CE01-000007d5
 dstchannel: SIP/44ADD9D47A6401-000007d6
    lastapp: Dial
   lastdata: SIP/44ADD9D47A6401,60,kr(ring)
   duration: 27
    billsec: 24
disposition: ANSWERED
   amaflags: 3
accountcode:
   uniqueid: 1541127744.6857
  userfield:
       site: 8
         tz: 0
  timestamp: 2018-11-02 03:02:52
         id: 4352614
   linkedid: 1541127744.6857
1 row in set (0.00 sec)

And see following CDR which was "outbound" (routed out to another
Asterisk server for PSTN connection):
mysql> select * from cdr where id = '4352617'\G
*************************** 1. row ***************************
   calldate: 2018-11-02 03:19:42
       clid: "Wallow" <XXXX>
        src: XXXX
        dst: XXXXXXXXXX
   dcontext: aad_anaresat
    channel: SIP/08CC68E8070801-000007da
 dstchannel: IAX2/cas1-kin1-19305
    lastapp: Dial
   lastdata: IAX2/ast1-cas1:@cas1-kin1/XXXXXXXXXX,90,
   duration: 0
    billsec: 0
disposition: ANSWERED
   amaflags: 3
accountcode: 784679
   uniqueid: 1541128747.6867
  userfield:
       site: 8
         tz: 0
  timestamp: 2018-11-02 03:19:42
         id: 4352617
   linkedid: 1541128747.6867
1 row in set (0.00 sec)


If I look at the CDR for the next leg of this call, I can see that the billsec
& duration are correctly recorded as 3 & 26 respectively, which is
correct. It just doesn't get recorded on the originating server.

We have only started seeing this behaviour when upgrading from 11.x to 13.x - So
it's something to do with the new CDR code..
Does anyone have any idea why a CDR would EVER have a blank duration &
billsec, when the disposition is ANSWERED??
Any tips would be great, because this is absolutely driving me crazy!

Thanks guys,

Calum


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