TIA-664.000-B-3[E]:2007 (R2013)

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.