Call waiting / Busy
A forwarding under "If no one answers" does not work, but you get a busy signal.
SHOULD: busy forward "If I'm already on the phone, please forward it"
busy forward internal
busy forward external

Hello, please provide additional details for this ask. Is a current setting your are using not working as desired? Thank you!
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Tim commented
What he means: there should be a "call forwarding busy" option. When you are busy, a second incomming line should be routed to another extension/queue.
When disableing Call Waiting, it doesn't follow "If no-one answers" but it goes to voicemail/busy signal. We want to setup a forward to another extension when an user is busy. Hitting DND while on a call is a workaround but to be honest, that's really not a solution.
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Michael commented
Same problem here, a "call forwarding on busy" feature is completely missing.
If an extension is already in an active call and a second call comes in to that extension, we want to forward this call to another extension or a call queue.There are other requests like this, but the solution is a bad joke:
https://community.ringcentral.com/ringex-phone-sms-fax-6/forwarding-to-a-call-queue-when-busy-9630
Nobody will swap to DnD manually while he is on a call :-(