  -keep class com.loftechs.sdk.call.message.* implements java.io.Serializable
  -keepclassmembers class com.loftechs.sdk.call.message.* implements java.io.Serializable {
      static final long serialVersionUID;
      private static final java.io.ObjectStreamField[] serialPersistentFields;
      !static !transient <fields>;
      !private <fields>;
      !private <methods>;
      private void writeObject(java.io.ObjectOutputStream);
      private void readObject(java.io.ObjectInputStream);
      java.lang.Object writeReplace();
      java.lang.Object readResolve();
  }

  -keep class org.pjsip.pjsua2.**  { *; }
  -keepclassmembers class org.pjsip.pjsua2.** {*;}
  -dontwarn org.pjsip.pjsua2.**
  -keep class com.loftechs.sdk.call.** { *; }