diff --git a/lib/src/room.dart b/lib/src/room.dart
index b28bec51..c8c80437 100644
--- a/lib/src/room.dart
+++ b/lib/src/room.dart
@@ -1593,16 +1593,14 @@ class Room {
   /// Returns the power level of the given user ID.
   int getPowerLevelByUserId(String userId) {
     var powerLevel = 0;
-    final powerLevelState = getState(EventTypes.RoomPowerLevels);
-    if (powerLevelState == null) return powerLevel;
-    if (powerLevelState.content['users_default'] is int) {
-      powerLevel = powerLevelState.content['users_default'];
-    }
-    if (powerLevelState.content
+    final powerLevelMap = getState(EventTypes.RoomPowerLevels)?.content;
+    if (powerLevelMap == null) return powerLevel;
+    powerLevel = getDefaultPowerLevel(powerLevelMap);
+    if (powerLevelMap
             .tryGet<Map<String, dynamic>>('users')
             ?.tryGet<int>(userId) !=
         null) {
-      powerLevel = powerLevelState.content['users'][userId];
+      powerLevel = powerLevelMap['users'][userId];
     }
     return powerLevel;
   }
@@ -1652,7 +1650,7 @@ class Room {
     final groupCallPowerLevel =
         powerLevelMap?.tryGetMap('events')?['org.matrix.msc3401.call.member'];
     return groupCallPowerLevel != null &&
-        groupCallPowerLevel >= powerLevelMap?['users_default'];
+        groupCallPowerLevel <= getDefaultPowerLevel(powerLevelMap!);
   }
 
   /// sets the `org.matrix.msc3401.call.member` power level to users default for
@@ -1663,7 +1661,8 @@ class Room {
     if (currentPowerLevelsMap != null) {
       final newPowerLevelMap = currentPowerLevelsMap;
       newPowerLevelMap['events'].addAll({
-        'org.matrix.msc3401.call.member': currentPowerLevelsMap['users_default']
+        'org.matrix.msc3401.call.member':
+            getDefaultPowerLevel(currentPowerLevelsMap)
       });
       await client.setRoomStateWithKey(
         id,
@@ -1674,6 +1673,11 @@ class Room {
     }
   }
 
+  /// Takes in `[m.room.power_levels].content` and returns the default power level
+  int getDefaultPowerLevel(Map<String, dynamic> powerLevelMap) {
+    return powerLevelMap.tryGet('users_default') ?? 0;
+  }
+
   /// The default level required to send message events. Can be overridden by the events key.
   bool get canSendDefaultMessages =>
       _hasPermissionFor('events_default') &&
diff --git a/test/room_test.dart b/test/room_test.dart
index b723a0e9..a757b4a9 100644
--- a/test/room_test.dart
+++ b/test/room_test.dart
@@ -460,6 +460,101 @@ void main() {
       expect(resp, '42');
     });
 
+    test('Enabling group calls', () async {
+      expect(room.groupCallsEnabled, false);
+      room.setState(
+        Event(
+          senderId: '@test:example.com',
+          type: 'm.room.power_levels',
+          room: room,
+          eventId: '123a',
+          content: {
+            'events': {'org.matrix.msc3401.call.member': 100},
+            'state_default': 50,
+            'users': {'@test:fakeServer.notExisting': 100},
+            'users_default': 0
+          },
+          originServerTs: DateTime.now(),
+          stateKey: '',
+        ),
+      );
+      expect(room.groupCallsEnabled, false);
+      room.setState(
+        Event(
+          senderId: '@test:example.com',
+          type: 'm.room.power_levels',
+          room: room,
+          eventId: '123a',
+          content: {
+            'events': {'org.matrix.msc3401.call.member': 27},
+            'state_default': 50,
+            'users': {'@test:fakeServer.notExisting': 100},
+            'users_default': 100
+          },
+          originServerTs: DateTime.now(),
+          stateKey: '',
+        ),
+      );
+      expect(room.groupCallsEnabled, true);
+      room.setState(
+        Event(
+            senderId: '@test:example.com',
+            type: 'm.room.power_levels',
+            room: room,
+            eventId: '123',
+            content: {
+              'events': {},
+              'state_default': 50,
+              'users': {'@test:fakeServer.notExisting': 100},
+              'users_default': 0
+            },
+            originServerTs: DateTime.now(),
+            stateKey: ''),
+      );
+      expect(room.groupCallsEnabled, false);
+      await room.enableGroupCalls();
+      expect(room.groupCallsEnabled, true);
+      room.setState(
+        Event(
+          senderId: '@test:example.com',
+          type: 'm.room.power_levels',
+          room: room,
+          eventId: '123',
+          content: {
+            'events': {},
+            'state_default': 50,
+            'users': {'@test:fakeServer.notExisting': 100},
+          },
+          originServerTs: DateTime.now(),
+          stateKey: '',
+        ),
+      );
+      await room.enableGroupCalls();
+      expect(room.groupCallsEnabled, true);
+      room.setState(
+        Event(
+          senderId: '@test:example.com',
+          type: 'm.room.power_levels',
+          room: room,
+          eventId: '123abc',
+          content: {
+            'ban': 50,
+            'events': {'m.room.name': 0, 'm.room.power_levels': 100},
+            'events_default': 0,
+            'invite': 50,
+            'kick': 50,
+            'notifications': {'room': 20},
+            'redact': 50,
+            'state_default': 50,
+            'users': {},
+            'users_default': 0
+          },
+          originServerTs: DateTime.now(),
+          stateKey: '',
+        ),
+      );
+    });
+
     test('invite', () async {
       await room.invite('Testname');
     });