In a dial-out operation, an application program can be authorized to override the dial number digits and other parameters specified in the switched major node for the device being contacted. The device can be PU types 1, 2, or 2.1. Normally, if these parameters do not match in XID (exchange identification), the connection is terminated. However, you can authorize an application to override this checking. Coding the AUTH=ASDP operand on the APPL definition statement allows the application to supply dial parameters to the model switched major node during session initiation.