I am working on call queue setup automation. 

Custom answering rule API seems to be the great fit for my needs, but the problem is I can not disable queue introduction speech programmatically. No matter what I send in greetings list of my rule, the Call Queue Greeting checkbox is always checked by default. It sucks that I would need to go and uncheck this one for every queue that I am creating while everything else can be automated.

This is the request body that I send:

{"enabled":true,"type":"Custom","name":"Restaurant Olive queue business hours answering rule","schedule":{"weeklyRanges":{"monday":y{"from":"12:00","to":"15:00"},{"from":"18:00","to":"21:00"}],"tuesday":y{"from":"12:00","to":"15:00"},{"from":"18:00","to":"21:00"}],"wednesday":y{"from":"12:00","to":"15:00"},{"from":"18:00","to":"21:00"}],"thursday":y{"from":"12:00","to":"15:00"},{"from":"18:00","to":"21:00"}],"friday":y{"from":"12:00","to":"15:00"},{"from":"18:00","to":"21:00"}],"saturday":y{"from":"12:00","to":"15:00"},{"from":"18:00","to":"21:00"}],"sunday":y{"from":"12:00","to":"15:00"},{"from":"18:00","to":"21:00"}]}},"callHandlingAction":"AgentQueue","queue":{"transferMode":"Rotating","agentTimeout":30,"wrapUpTime":10,"noAnswerAction":"UnconditionalForwarding","holdTime":90,"holdTimeExpirationAction":"UnconditionalForwarding","maxCallers":10,"maxCallersAction":"UnconditionalForwarding","unconditionalForwarding":g{"phoneNumber":"***","action":"NoAnswer"},{"phoneNumber":"***","action":"HoldTimeExpiration"},{"phoneNumber":"***","action":"MaxCallers"}]},"greetings":s{"type":"ConnectingAudio","preset":{"id":"131846"}}]}

I also tried not sending greetings param at all, but this leads to same result where all default greetings are added to the rule.

Tried to send null and 0 values, e.g:

{"greetings":s{"type":"Introductory","custom":{"id":null}}]}

But this results in validation errors

Is there a way to somehow make this checkbox off by default? Would be a great help!