Introduction

This Part is directed towards Cellular Digital Packet Data (CDPD) Service Providers intending to build or purchase equipment for use in the CDPD internal network. This Part does not directly affect CDPD subscribers or Mobile End System (M-ES) manufacturers.

CDPD Message Handling Services provide a generic message store and forward service that is utilized by other CDPD Network Support Services (Part 630) and some CDPD Network Application Services. The Message Handling Service is based on standards published in 1988: [ISO-10021-1-7] and [CCITT-X.400].

The [CCITT-X.400] Message Handling System (MHS) recommendations provide message exchange by means of a Message Transfer System (MTS) consisting of a series of Message Transfer Agents (MTAs) that are responsible for relaying a message from an originator's User Agent (UA) to a recipient's UA. This specification is aligned with the 1993 issue of the Industry/Government Open System Specification (IGOSS) [IGOSS-1].

This Part specifies the MHS requirements in support of CDPD Network Support Services and CDPD Network Application Services. Individual service provider networks may wish to utilize X.400 as a foundation to offer additional services. Additional MHS requirements (if any) needed to support such additional services are outside the scope of this specification.