Back to ivr when extension is busy?

i enable “direct dial” in ivr.

when the dialed extensions is busy , i want ivr play “busy, try another number” to caller instead of hanging up directly.

it seems a classic function but i am too stupid to find out how to do it in freepbx.

i guess maybe i can create ring-group for every extension, and put every ring-group in the ivr. since ring-group has failover destation, i can put “busy prompt” ivr to the failover destation.

are there better ways to implement this function?

thanks a lot for help!

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