diff --git a/fishjam/media_events/peer/peer.proto b/fishjam/media_events/peer/peer.proto
new file mode 100644
index 0000000..e577f5d
--- /dev/null
+++ b/fishjam/media_events/peer/peer.proto
@@ -0,0 +1,76 @@
+syntax = "proto3";
+
+package fishjam.media_events.peer;
+
+import "fishjam/media_events/shared.proto";
+
+// Defines any type of message sent from Peer to Membrane RTC Engine
+message MediaEvent {
+  // SCHEMAS
+  message VariantBitrate {
+    media_events.Variant variant = 1;
+    int32 bitrate = 2;
+  }
+
+  message TrackIdToMetadata {
+    string track_id = 1;
+    media_events.Metadata metadata = 2;
+  }
+
+  message TrackIdToBitrates {
+    oneof tracks {
+      TrackBitrate track_bitrate = 1;
+    }
+  }
+
+  // MEDIA EVENTS
+
+  // Sent when a peer wants to join WebRTC Endpoint.
+  message Connect {
+    media_events.Metadata metadata = 1;
+  }
+
+  // Sent when a peer disconnects from WebRTC Endpoint.
+  message Disconnect {}
+
+  // Sent when a peer wants to update its metadata
+  message UpdateEndpointMetadata {
+    media_events.Metadata metadata = 1;
+  }
+
+  // Sent when a peer wants to update its track's metadata
+  message UpdateTrackMetadata {
+    string track_id = 1;
+    media_events.Metadata metadata = 2;
+  }
+
+  // Sent when peer wants to renegatiate connection due to adding a track or removing a track
+  message RenegotiateTracks {}
+
+  // Sent as a response to `offerData` media event during renegotiation
+  // Maps contain only information about current peer's `sendonly` tracks.
+  // The "mid" is an identifier used to associate an RTP packet with an MLine from the SDP offer/answer.
+  message SdpOffer {
+    string sdp_offer = 1;
+    repeated TrackIdToMetadata track_id_to_metadata = 2;
+    repeated TrackIdToBitrates track_id_to_bitrates = 3;
+    repeated media_events.MidToTrackId mid_to_track_id = 4;
+  }
+
+  // Sent when Peer wants to update its track's bitrate
+  message TrackBitrate {
+    string track_id = 1;
+    int32 bitrate = 2;
+  }
+
+  oneof content {
+    Connect connect = 1;
+    Disconnect disconnect = 2;
+    UpdateEndpointMetadata update_endpoint_metadata = 3;
+    UpdateTrackMetadata update_track_metadata = 4;
+    RenegotiateTracks renegotiate_tracks = 5;
+    media_events.Candidate candidate = 6;
+    SdpOffer sdp_offer = 7;
+    TrackBitrate track_bitrate = 8;
+  }
+}
diff --git a/fishjam/media_events/server/server.proto b/fishjam/media_events/server/server.proto
new file mode 100644
index 0000000..448d13c
--- /dev/null
+++ b/fishjam/media_events/server/server.proto
@@ -0,0 +1,115 @@
+syntax = "proto3";
+
+package fishjam.media_events.server;
+
+import "fishjam/media_events/shared.proto";
+
+// Defines any type of message sent from Membrane RTC Engine to Peer
+message MediaEvent {
+  // SCHEMAS
+  message Track {
+    string track_id = 1;
+    media_events.Metadata metadata = 2;
+  }
+
+  message Endpoint {
+    string endpoint_id = 1;
+    string endpoint_type = 2;
+    media_events.Metadata metadata = 3;
+    repeated Track tracks = 4;
+  }
+
+  // MEDIA EVENTS
+
+  // Sent when metadata of one of the endpoints was updated
+  message EndpointUpdated {
+    string endpoint_id = 1;
+    media_events.Metadata metadata = 2;
+  }
+
+  // Sent when metadata of one of the tracks was updated
+  message TrackUpdated {
+    string endpoint_id = 1;
+    string track_id = 2;
+    media_events.Metadata metadata = 3;
+  }
+
+  //  Sent to informs that one of the peers has added one or more tracks.
+  message TracksAdded {
+    string endpoint_id = 1;
+    repeated Track tracks = 2;
+  }
+
+  //  Sent to informs that one of the peers has removed one or more tracks.
+  message TracksRemoved {
+    string endpoint_id = 1;
+    repeated string track_ids = 2;
+  }
+
+  // Sent to all peers in the room after a new endpoint was added.
+  message EndpointAdded {
+    string endpoint_id = 1;
+    media_events.Metadata metadata = 2;
+  }
+
+  // Sent to the peer after connecting to the WebRTC Endpoint.
+  message Connected {
+    string endpoint_id = 1;
+    repeated Endpoint endpoints = 2;
+  }
+
+  // Sent to all remaining peers in the room after some endpoint was removed.
+  message EndpointRemoved {
+    string endpoint_id = 1;
+  }
+
+  // Sent to inform that an error occurred on the server providing a message to show
+  message Error {
+    string message = 1;
+  }
+
+  // Sent to inform about the number of audio and video tracks that will be sent from the engine to the peer
+  message OfferData {
+    message TrackTypes {
+      int32 audio = 1;
+      int32 video = 2;
+    }
+
+    TrackTypes tracks_types = 1;
+  }
+
+  // Sent after receiving `SdpOffer` from Peer
+  message SdpAnswer {
+    string sdp_answer = 1;
+    repeated media_events.MidToTrackId mid_to_track_id = 2;
+  }
+
+  // Sent to inform that the track denoted by `trackId` has changed their voice actiivty
+  // For this notification to work, the server must be configured to use VAD extension
+  // and the sender must support it.
+  message VadNotification {
+    enum Status {
+      STATUS_UNSPECIFIED = 0;
+      STATUS_SILENCE = 1;
+      STATUS_SPEECH = 2;
+    }
+
+    string track_id = 1;
+    Status status = 2;
+  }
+
+  oneof content {
+    EndpointUpdated endpoint_updated = 1;
+    TrackUpdated track_updated = 2;
+    TracksAdded tracks_added = 3;
+    TracksRemoved tracks_removed = 4;
+    EndpointAdded endpoint_added = 5;
+    EndpointRemoved endpoint_removed = 6;
+    Connected connected = 7;
+    Error error = 8;
+    OfferData offer_data = 9;
+    media_events.Candidate candidate = 10;
+    SdpAnswer sdp_answer = 11;
+    VadNotification vad_notification = 12;
+  }
+}
diff --git a/fishjam/media_events/shared.proto b/fishjam/media_events/shared.proto
new file mode 100644
index 0000000..b66496f
--- /dev/null
+++ b/fishjam/media_events/shared.proto
@@ -0,0 +1,27 @@
+syntax = "proto3";
+
+package fishjam.media_events;
+
+enum Variant {
+  VARIANT_UNSPECIFIED = 0;
+  VARIANT_LOW = 1;
+  VARIANT_MEDIUM = 2;
+  VARIANT_HIGH = 3;
+}
+
+message Metadata {
+  string json = 1;
+}
+
+message MidToTrackId {
+  string mid = 1;
+  string track_id = 2;
+}
+
+// Contains information about an ICE candidate which will be sent to the peer/server
+message Candidate {
+  string candidate = 1;
+  int32 sdp_m_line_index = 2;
+  string sdp_mid = 3;
+  string username_fragment = 4;
+}
diff --git a/fishjam/peer_notifications.proto b/fishjam/peer_notifications.proto
index aff60c2..d75bc5e 100644
--- a/fishjam/peer_notifications.proto
+++ b/fishjam/peer_notifications.proto
@@ -2,6 +2,9 @@ syntax = "proto3";
 
 package fishjam;
 
+import "fishjam/media_events/peer/peer.proto";
+import "fishjam/media_events/server/server.proto";
+
 // Defines any type of message sent between FJ and a peer
 message PeerMessage {
   // Response sent by FJ, confirming successfull authentication
@@ -10,11 +13,7 @@ message PeerMessage {
   // Request sent by peer, to authenticate to FJ server
   message AuthRequest {
     string token = 1;
-  }
-
-  // Any type of WebRTC messages passed betweend FJ and peer
-  message MediaEvent {
-    string data = 1;
+    string sdk_version = 2;
   }
 
   // PeerConnection stats sent by peer
@@ -26,7 +25,8 @@ message PeerMessage {
   oneof content {
     Authenticated authenticated = 1;
     AuthRequest auth_request = 2;
-    MediaEvent media_event = 3;
-    RTCStatsReport rtc_stats_report = 4;
+    media_events.peer.MediaEvent peer_media_event = 3;
+    media_events.server.MediaEvent server_media_event = 4;
+    RTCStatsReport rtc_stats_report = 5;
   }
 }
diff --git a/fishjam/server_notifications.proto b/fishjam/server_notifications.proto
index c3814c6..a137bce 100644
--- a/fishjam/server_notifications.proto
+++ b/fishjam/server_notifications.proto
@@ -2,7 +2,7 @@ syntax = "proto3";
 
 package fishjam;
 
-// Defines any type of message passed between FJ and server client
+// Defines any type of message passed between FJ and server peer
 message ServerMessage {
   // Notification sent when a room crashes
   message RoomCrashed {
@@ -49,19 +49,19 @@ message ServerMessage {
   // Response sent by FJ, confirming successfull authentication
   message Authenticated {}
 
-  // Request sent by client, to authenticate to FJ server
+  // Request sent by peer, to authenticate to FJ server
   message AuthRequest {
     string token = 1;
   }
 
-  // Defines message groups for which client can subscribe
+  // Defines message groups for which peer can subscribe
   enum EventType {
     EVENT_TYPE_UNSPECIFIED = 0;
     EVENT_TYPE_SERVER_NOTIFICATION = 1;
     EVENT_TYPE_METRICS = 2;
   }
 
-  // Request sent by client to subsribe for certain message type
+  // Request sent by peer to subsribe for certain message type
   message SubscribeRequest {
     EventType event_type = 1;
   }