This part of the Standard defines the protocol suite used to provide to cellular radio telephone subscribers certain services requiring interaction between different cellular systems. These services are described@ from a user??s perspective@ in [TIA/EIA-664]. The intersystem operations?? functions and information flows associated with these services are described in the other parts of this Standard.Specifically@ the scope of this part of the Standard is:1. To define the Mobile Application Part (MAP) signaling messages and parameters which support the intersystem operations functionality specified in the other parts of this Standard. This includes:? the Intersystem Handoff functionality specified in Chapter 2@ ? the Automatic Roaming functionality specified in Chapter 3@ and ? the Intersystem OAM functionality specified in Chapter 4The procedures associated with the processing of MAP signaling information are specified in Chapter 6.To provide references to@ and qualifications on@ the service and protocol standards which are recommended in this Standard for the support of the MAP.