Apps How to replace native ConnectionService?

[Halvisch]

I've been trying for two days now, to replace the native ConnectionSerivce, with no success. Here's what I've done, as stated in the documentation.

• I've created a class which extends ConnectionService.
  
  
• I've registered my implementation in the AndroidManifest.xml:
  <service android:name="se.example.myapplication.MyConnectionService"
  android:label="@String/MyConnectionService"
  androidermission="android.permission.BIND_TELECOM_CONNECTION_SERVICE">
  <intent-filter>
  <action android:name="android.telecom.ConnectionService" />
  </intent-filter>
  </service>
  
• I've registered a new PhoneAccount:
  ComponentName componentName = new ComponentName("se.example.myapplication", "se.example.myapplication.MyConnectionService");
  PhoneAccountHandle phoneAccountHandle = new PhoneAccountHandle(componentName, "1234");
  PhoneAccount phoneAccount = PhoneAccount.builder(phoneAccountHandle, "Adminn").build();
  telecomManager.registerPhoneAccount(phoneAccount);

The telecom still won't bind to my ConnectionService once I place a call. Does anyone have any ideas, please?
Thanks.