1A Voice Storage System: Architecture and Physical Design

1.1 Background Custom Calling Services now available to electronic switching system (ESS) customers have been implemented through software features and the existing switching periphery associated with the ESS system itself. However, the new Custom Calling Services II (ccs II) feature package for No. 1/1A ESS customers has created the need for a new functional capability not available in the existing plant: high-capacity, high-availability, and rapid-access voice storage. Additionally, the complexity and real-time processing demands of ccs II creates the need for auxiliary processor support for the implementation of these services. In response to these needs, a new node in the Stored Program Control (SPC) network has been developed: the 1A Voice Storage System (1A vss). The 1A vss is a generalized resource with the ability to receive, store, administer, compose, and deliver voice messages or announcements. The capacity of the 1A vss is such that it may be deployed in a centralized fashion, each system serving tens of ESS 841