Service Profile Verification and Service Profile Management (SPV and SPM) are optional ISDN Interface management services. They are provided by the network to the customer to allow some real-time customer network management capabilities and to allow some management across the user?Cnetwork interface by the network provider. The two services SPV and SPM apply to both ISDN Basic Rate Access (BRA) and primary Rate Access (PRA) and hence are further classified as SPV-B/SPM-B and SPV-P/SPM-P for basic and primary rate ISDN@ respectively. A three-stage approach is employed to describe ISDN interface management services. Stage 1 is a prose description of the management service. Stage 2 defines the information flow between the network and the customer. Stage 3 defines the protocols required to implement the particular management service. Protocol specification for stage 3 is beyond the scope of this document and will be defined in future American National Standards.