Debuging Calls which don't connect, Sequence With Zulu Items question

We are experiencing frequent calls to our DAHDI FXO which, when answered, the line is dead.
Upon investigating call sequence, I find a number of Zulu items which I do not understand. These do not seem to appear in our SIP calls. Are these correct and what is their function?
Thanks.

Time Event CNAM CNUM ANI DID AMA exten context App channel UserDefType EventExtra CEL Table
Wed, 24 Jul 2019 16:17 CHAN_START DEFAULT s from-analog DAHDI/1-1
Wed, 24 Jul 2019 16:17 CHAN_START Operator 300 DEFAULT s from-internal SIP/300-00000027
Wed, 24 Jul 2019 16:17 CHAN_START DEFAULT 90301 zulu-call Local/90301@zulu-call-0000000c;1
Wed, 24 Jul 2019 16:17 CHAN_START DEFAULT 90301 zulu-call Local/90301@zulu-call-0000000c;2
Wed, 24 Jul 2019 16:17 CHAN_START Roger 310 DEFAULT s from-internal SIP/310-00000028
Wed, 24 Jul 2019 16:17 CHAN_START DEFAULT 90310 zulu-call Local/90310@zulu-call-0000000d;1
Wed, 24 Jul 2019 16:17 CHAN_START DEFAULT 90310 zulu-call Local/90310@zulu-call-0000000d;2
Wed, 24 Jul 2019 16:17 CHAN_START Master Bedroom 315 DEFAULT s from-internal SIP/315-00000029
Wed, 24 Jul 2019 16:17 HANGUP STAMFORD, CT 2035708465 2035708465 DEFAULT 90301 zulu-call Local/90301@zulu-call-0000000c;2
Wed, 24 Jul 2019 16:17 CHAN_END STAMFORD, CT 2035708465 2035708465 DEFAULT 90301 zulu-call Local/90301@zulu-call-0000000c;2
Wed, 24 Jul 2019 16:17 HANGUP 601 DEFAULT 601 zulu-call AppDial Local/90301@zulu-call-0000000c;1
Wed, 24 Jul 2019 16:17 CHAN_END 601 DEFAULT 601 zulu-call AppDial Local/90301@zulu-call-0000000c;1
Wed, 24 Jul 2019 16:17 HANGUP STAMFORD, CT 2035708465 2035708465 DEFAULT 90310 zulu-call Local/90310@zulu-call-0000000d;2
Wed, 24 Jul 2019 16:17 CHAN_END STAMFORD, CT 2035708465 2035708465 DEFAULT 90310 zulu-call Local/90310@zulu-call-0000000d;2
Wed, 24 Jul 2019 16:17 HANGUP 601 DEFAULT 601 zulu-call AppDial Local/90310@zulu-call-0000000d;1
Wed, 24 Jul 2019 16:17 CHAN_END 601 DEFAULT 601 zulu-call AppDial Local/90310@zulu-call-0000000d;1
Wed, 24 Jul 2019 16:18 HANGUP Operator 300 300 DEFAULT 601 from-internal AppDial SIP/300-00000027
Wed, 24 Jul 2019 16:18 CHAN_END Operator 300 300 DEFAULT 601 from-internal AppDial SIP/300-00000027
Wed, 24 Jul 2019 16:18 HANGUP Roger 310 310 DEFAULT 601 from-internal AppDial SIP/310-00000028
Wed, 24 Jul 2019 16:18 CHAN_END Roger 310 310 DEFAULT 601 from-internal AppDial SIP/310-00000028
Wed, 24 Jul 2019 16:18 HANGUP Master Bedroom 315 315 DEFAULT 601 from-internal AppDial SIP/315-00000029
Wed, 24 Jul 2019 16:18 CHAN_END Master Bedroom 315 315 DEFAULT 601 from-internal AppDial SIP/315-00000029
Wed, 24 Jul 2019 16:18 ANSWER STAMFORD, CT 2035708465 2035708465 DEFAULT s ivr-1 Answer DAHDI/1-1
Wed, 24 Jul 2019 16:18 HANGUP STAMFORD, CT 2035708465 2035708465 DEFAULT h ivr-1 DAHDI/1-1
Wed, 24 Jul 2019 16:18 CHAN_END STAMFORD, CT 2035708465 2035708465 DEFAULT h ivr-1 DAHDI/1-1
Wed, 24 Jul 2019 16:18 LINKEDID_END STAMFORD, CT 2035708465 2035708465 DEFAULT h ivr-1 DAHDI/1-1

Do you have Zulu licensed and enabled?

I did the trial (definitely too early) which has expired. I disabled Zulu but no change.
I then decided to go to a backup image from April and the Zulu items seem to have not reappeared.

My numerious rings on the DAHDI line before pickup also have vanished.

My remaining problem is the transfer to IVR on calls via DAHDI are not working. The call log shows the transfer but the caller continues to hear rings for some length of time then silence. The IVR works correctly on calls via my SIP service with the same setup.

FreePBX 14.0.13.4

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