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proposals/4002-walkie-talkie.md

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+# MSC4002: Walkie-Talkie 
+
+Implementing a Walkie-Talkie-like feature to enhance its communication capabilities.
+The proposed feature would allow users to send and receive E2EE voice messages
+in real-time, similar to how a Walkie-Talkie operates.
+This functionality will require protocol changes as broadcast need to be locked server
+side for everyone when one person is talking and it needs permission management. 
+Real-time Voice Communication is often needed at a workplace or can be usefull in a group
+of friends or even families when parents could want to maintain easy
+communication with a child 24/7.
+
+## Proposal
+
+	Real-time Voice Communication:
+Voice messages are sent and received in real-time, allowing for instant 
+communication without the need for typing or waiting for messages to be fully dictated/recorded.
+
+	Walkie-Talkie instantiation:
+Works on top of a room for everyone that allowed receiving Real-time Voice
+Communication in that specific room.
+For all participating in receiving Real-time Voice Communication, typical record and send
+voice communication turns into live broadcast VoIP on demand.
+There only can be one user speaking at the time so protocol must lock it for everyone else.
+
+	Bridges and Other Users:
+Walkie-Talkie broadcast recording will display as regular voice message for everyone to replay.
+	
+	Permissions:
+Only users that are willing to receive Walkie-Talkie broadcast can broadcast themselves
+Walkie-Talkie receiving and sending permit can be time limited or permanent
+depending on user preference.
+Permission is device based and every device that accepted it will receive it.
+
+## Potential issues
+
+Walkie-Talkie broadcast recordings are usefull for everyone but could litter chat history.
+
+User can be in multiple Walkie-Talkie groups in the same time, client need to cache unplayed
+messages while user is recording or playing other broadcasts.
+
+50% of this project is client side dependent.
+
+What if slight delay between home servers results in allowing 2 users speak at the same time?
+Homeserver could go and ask every other homeserver if anyone is talking and lock audio for a while
+but some Homeservers have like 1s ping.
+
+VoIP really needs to be on demand so it wont use battery and internet while in sleep state.
+Socket like system could turn it on and off.
+
+## Alternatives
+
+Regular VoIP still exist however it isn't perfect in work environment.
+
+## Security considerations
+
+Recordings of broadcasts for future replay need to be client side dependent to preserve E2EE.
+
+## Unstable prefix
+
+No unstable prefix is currently proposed.
+
+## Dependencies
+
+No dependencies are currently needed.