docs: @Override
      public String nextCalledName ( CIFSContext tc ) {
          if ( this.addr instanceof NbtAddress ) {
              return ( (NbtAddress) this.addr ).nextCalledName(tc);
          }
          else if ( this.calledName != NbtAddress.SMBSERVER_NAME ) {
              this.calledName = NbtAddress.SMBSERVER_NAME;
              return this.calledName;
          }
          return null;
      }