Channel support for voice chats/rooms
Simply let a channel admin create a voice chat (with everyone else on mute by default, unless they're specifically unmuted by an admin - this can be a configurable setting).
That way a channel can easily communicate with his followers!
When group video calls will be implemented, this feature can go hand to hand with live video streaming support; as suggested here https://bugs.telegram.org/c/80
As of March 2021 it is possible to create voice chats in channels. There are no more limits on the number of participants.
The update also brings recordable voice chats, rich lists of participants, raise hand mechanics, invite links for speakers and listeners, voice chat titles, and a way for public figures to join voice chats as their channels.
You can find more information about the update in the blog: https://telegram.org/blog/voice-chats-on-steroids