Allow multiple participants in conference call using Mitel phone
With MITEL, was able to do conference call with multiple people that allows more than 3 participants. When switched to RingCentral, can only do up to 3 people including the initiator. With RingCentral, call the first person, hit conference button, dial the second person, then hit the conference button again to join. Then, after this conference button disappears and there is even no option to add more person in the call.

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Ilya commented
Looks like it's been a year with no movement on this. Also migrated to RingCentral from Mitel/Shoretel, have RC's recommended Cisco 8851 Phones, but unable to have an ad-hoc conference with more than 2 other callers.
RC, are you doing anything about this?