"This document provides descriptions and standard operational procedures for a number of specific features. These particular features were selected with the following considerations in mind: ? The list of features is restricted to those features that afford the subscriber an acceptable degree of control over common call situations. No attempt is made to ""standardize"" all of the features that are@ may be@ or could be made available in the wireless industry. The objective is to provide subscribers with reasonable comfort and familiarity as they move between systems while not infringing on the need of manufacturers and service providers to compete by means of nonstandard offerings. ? All selected features can be implemented@ in their ""standard"" form by MSCs designed to serve smaller markets; i.e.@ standard procedures should not have unduly burdensome memory and processing capacity requirements. Individual manufacturers may offer ""enhanced"" versions of standard features; however@ such enhancements should not surprise the unsuspecting subscriber by deviations from the standard. Feature options should provide flexibility of the manufacturers' and service providers' offerings. ? Certain features may also be implemented using a ""Wireless Intelligent Network"" (WIN) architecture@ in which case the functionality required to provide features (such as service switching@ service control@ service data@ and special resources) may be distributed throughout the network. In such a case@ the service control or service data functions associated with features may be distributed among the MSC@ HLR@ SCP@ SN@ IP@ or other network elements@ and the interactions between features must be managed carefully to prevent undesirable or unexpected results. Feature Interaction Manager and Service Interaction Manager procedures should be implemented in networks employing such an architecture. ? The features selected provide as much home service provider control over the feature operation as possible. This is to allow for competition between manufacturers and service providers@ while providing seamless feature operation to the subscribers. The mechanisms for these features should allow other home system controlled features to be implemented without sacrificing seamlessness."