These technical requirements form a compatibility standard for communication between a Personal Base (PB) and Authorization and Call Routing Equipment (ACRE). Their purpose is to ensure that a PB built according to this standard can communicate with any ACRE manufactured according to this standard. Conversely, these technical requirements ensure that an ACRE manufactured according to this standard can communicate with any PB built according to this standard. These requirements do not address the quality or reliability of this service, nor do they cover equipment performance or measurement procedures.