diff --git a/src/signaling/api_signaling.go b/src/signaling/api_signaling.go
index f6b2350..cf4b587 100644
--- a/src/signaling/api_signaling.go
+++ b/src/signaling/api_signaling.go
@@ -399,6 +399,17 @@ type RoomEventServerMessage struct {
 	Users   []map[string]interface{} `json:"users,omitempty"`
 }
 
+const (
+	DisinviteReasonDisinvited = "disinvited"
+	DisinviteReasonDeleted    = "deleted"
+)
+
+type RoomDisinviteEventServerMessage struct {
+	RoomEventServerMessage
+
+	Reason string `json:"reason"`
+}
+
 type RoomEventMessage struct {
 	RoomId string           `json:"roomid"`
 	Data   *json.RawMessage `json:"data,omitempty"`
@@ -414,9 +425,9 @@ type EventServerMessage struct {
 	Change []*EventServerMessageSessionEntry `json:"change,omitempty"`
 
 	// Used for target "roomlist" / "participants"
-	Invite    *RoomEventServerMessage `json:"invite,omitempty"`
-	Disinvite *RoomEventServerMessage `json:"disinvite,omitempty"`
-	Update    *RoomEventServerMessage `json:"update,omitempty"`
+	Invite    *RoomEventServerMessage          `json:"invite,omitempty"`
+	Disinvite *RoomDisinviteEventServerMessage `json:"disinvite,omitempty"`
+	Update    *RoomEventServerMessage          `json:"update,omitempty"`
 
 	// Used for target "message"
 	Message *RoomEventMessage `json:"message,omitempty"`
diff --git a/src/signaling/backend_server.go b/src/signaling/backend_server.go
index 1fbf523..1a8d939 100644
--- a/src/signaling/backend_server.go
+++ b/src/signaling/backend_server.go
@@ -291,14 +291,17 @@ func (b *BackendServer) sendRoomInvite(roomid string, userids []string, properti
 	}
 }
 
-func (b *BackendServer) sendRoomDisinvite(roomid string, userids []string, sessionids []string) {
+func (b *BackendServer) sendRoomDisinvite(roomid string, reason string, userids []string, sessionids []string) {
 	msg := &ServerMessage{
 		Type: "event",
 		Event: &EventServerMessage{
 			Target: "roomlist",
 			Type:   "disinvite",
-			Disinvite: &RoomEventServerMessage{
-				RoomId: roomid,
+			Disinvite: &RoomDisinviteEventServerMessage{
+				RoomEventServerMessage: RoomEventServerMessage{
+					RoomId: roomid,
+				},
+				Reason: reason,
 			},
 		},
 	}
@@ -519,14 +522,14 @@ func (b *BackendServer) roomHandler(w http.ResponseWriter, r *http.Request, body
 		b.sendRoomInvite(roomid, request.Invite.UserIds, request.Invite.Properties)
 		b.sendRoomUpdate(roomid, request.Invite.UserIds, request.Invite.AllUserIds, request.Invite.Properties)
 	case "disinvite":
-		b.sendRoomDisinvite(roomid, request.Disinvite.UserIds, request.Disinvite.SessionIds)
+		b.sendRoomDisinvite(roomid, DisinviteReasonDisinvited, request.Disinvite.UserIds, request.Disinvite.SessionIds)
 		b.sendRoomUpdate(roomid, request.Disinvite.UserIds, request.Disinvite.AllUserIds, request.Disinvite.Properties)
 	case "update":
 		err = b.nats.PublishBackendServerRoomRequest("backend.room."+roomid, &request)
 		b.sendRoomUpdate(roomid, nil, request.Update.UserIds, request.Update.Properties)
 	case "delete":
 		err = b.nats.PublishBackendServerRoomRequest("backend.room."+roomid, &request)
-		b.sendRoomDisinvite(roomid, request.Delete.UserIds, nil)
+		b.sendRoomDisinvite(roomid, DisinviteReasonDeleted, request.Delete.UserIds, nil)
 	case "incall":
 		err = b.sendRoomIncall(roomid, &request)
 	case "participants":
diff --git a/src/signaling/backend_server_test.go b/src/signaling/backend_server_test.go
index 957d7bd..fa932b5 100644
--- a/src/signaling/backend_server_test.go
+++ b/src/signaling/backend_server_test.go
@@ -402,6 +402,8 @@ func TestBackendServer_RoomDisinvite(t *testing.T) {
 		t.Errorf("Expected room %s, got %+v", roomId, event)
 	} else if event.Disinvite.Properties != nil {
 		t.Errorf("Room properties should be omitted, got %s", string(*event.Disinvite.Properties))
+	} else if event.Disinvite.Reason != "disinvited" {
+		t.Errorf("Reason should be disinvited, got %s", event.Disinvite.Reason)
 	}
 
 	if message, err := client.RunUntilRoomlistDisinvite(ctx); err != nil {
@@ -679,6 +681,8 @@ func TestBackendServer_RoomDelete(t *testing.T) {
 		t.Errorf("Expected room %s, got %+v", roomId, event)
 	} else if event.Disinvite.Properties != nil {
 		t.Errorf("Room properties should be omitted, got %s", string(*event.Disinvite.Properties))
+	} else if event.Disinvite.Reason != "deleted" {
+		t.Errorf("Reason should be deleted, got %s", event.Disinvite.Reason)
 	}
 
 	// TODO: Use event to wait for NATS messages.
diff --git a/src/signaling/testclient_test.go b/src/signaling/testclient_test.go
index 4856aff..20d57cc 100644
--- a/src/signaling/testclient_test.go
+++ b/src/signaling/testclient_test.go
@@ -598,7 +598,7 @@ func (c *TestClient) RunUntilRoomlistUpdate(ctx context.Context) (*RoomEventServ
 	}
 }
 
-func checkMessageRoomlistDisinvite(message *ServerMessage) (*RoomEventServerMessage, error) {
+func checkMessageRoomlistDisinvite(message *ServerMessage) (*RoomDisinviteEventServerMessage, error) {
 	if err := checkMessageType(message, "event"); err != nil {
 		return nil, err
 	} else if message.Event.Target != "roomlist" {
@@ -610,7 +610,7 @@ func checkMessageRoomlistDisinvite(message *ServerMessage) (*RoomEventServerMess
 	return message.Event.Disinvite, nil
 }
 
-func (c *TestClient) RunUntilRoomlistDisinvite(ctx context.Context) (*RoomEventServerMessage, error) {
+func (c *TestClient) RunUntilRoomlistDisinvite(ctx context.Context) (*RoomDisinviteEventServerMessage, error) {
 	if message, err := c.RunUntilMessage(ctx); err != nil {
 		return nil, err
 	} else {