Add maximum active calls configuration

Author: artemkrachulov

MatrixSDK/VoIP/CallKit/MXCallKitAdapter.h

@@ -59,6 +59,14 @@ API_AVAILABLE(ios(10.0))
  */
 + (BOOL)callKitAvailable;
 
+/**
+ The maximum number of calls.
+ 
+ Defaults is -1. Any count
+ */
+@property (nonatomic) NSUInteger maximumActiveCalls;
+
+
 @end
 
 NS_ASSUME_NONNULL_END

MatrixSDK/VoIP/CallKit/MXCallKitAdapter.m

@@ -68,6 +68,8 @@ - (instancetype)initWithConfiguration:(MXCallKitConfiguration *)configuration
         _callController = [[CXCallController alloc] initWithQueue:dispatch_get_main_queue()];
 
         _calls = [NSMutableDictionary dictionary];
+      
+        _maximumActiveCalls = -1;
     }
 
     return self;

MatrixSDK/VoIP/MXCallManager.m

@@ -490,6 +490,14 @@ - (void)handleCallInvite:(MXEvent *)event
             call = [[MXCall alloc] initWithRoomId:nativeRoomId callSignalingRoomId:event.roomId andCallManager:self];
             if (call)
             {
+              
+                if (_callKitAdapter.maximumActiveCalls != -1 && calls.count >= _callKitAdapter.maximumActiveCalls) {
+                
+                  [call hangupWithReason: MXCallHangupReasonUserBusy];
+                
+                  return;
+                }
+              
                 [calls addObject:call];
 
                 [call handleCallEvent:event];