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Sorry, I've asked for assistance with our Supports as well and there's no workaround available to have more than 4 members to a ring group or Simultaneous type of ring.
Call forwarding can be done on your web portal.
Please check this link to know more https://support.ringcentral.com/article/9758.html. Thank you!
I'm able to have 6 extensions ring simultaneously in a call queue. Haven't noticed this issue