BeFriend.Services.MonitorClass.MonitorCallState C# (CSharp) Метод

        private void MonitorCallState()
        {
            PhoneCallManager.CallStateChanged += (o, args) =>
            {
                _doesPhoneCallExist = PhoneCallManager.IsCallActive || PhoneCallManager.IsCallIncoming;
                if (ActivePhoneCallStateChanged != null)
                {
                    ActivePhoneCallStateChanged();
                }
            };
        }