Lucent Technologies 555-661-150 manual Non-Local Dial Plans and Facilities Planning

MERLIN LEGEND Communications System Release 6.1	Issue 1
Network Reference 555-661-150	August 1998
2 Call-Handling Scenarios
Network Configuration Scenarios	Page 2-76
Non-Local Dial Plans and Facilities Planning	2

This section explains how non-local dial plans, calling groups, switch identifiers, UDP routing, ARS routing, and remote access are set up for each system. Not all details are provided for all facilities and extensions.

Intersystem calling is not illustrated in detail for Scenario 4, but Table 2–19, page 2-79 shows the applicable extension ranges, patterns, and primary routes for tandem and PSTN facility pools when people in one system call people at non- local dial plan extensions. Some UDP routes are reserved for high-speed data/video calls between systems, and a pair of extension numbers (5610–5611) on the headquarters System E is dedicated to executive videoconferences. When considering intersystem calling, keep the following facts in mind:

■Intersystem voice calls to and from System G do not display calling name or number information at MLX display telephone or PassageWay recipients, because these calls travel over tandem tie trunks.

■Notice that because System G is connected to the private network by analog tandem tie trunks, its BRI facilities are used by users at other systems to call the single 2B data extension on System G. The 2B data extension on System G is a video system, and users there call only certain video extensions on other private network systems (only the executive video extension on System E is accessed, for example). If a System H user calls a 2B data extension on System G, the call is routed first over tandem PRI facilities to System E, which prepends the necessary digits and sends the call over the PSTN on a PRI facility. When the call arrives on the System G BRI facility, it is routed directly to the video system.

■Because tandem tie lines are used instead of PRI tandem trunks to connect system G to system E, inside calls to the centralized VMS/AA appear as outside calls. For the centralized VMS/AA, this means that all calls are treated as outside calls and the centralized VMS/AA cannot provide different call handling and/or greetings based on the type of call. Also, Message Waiting Light updates for non-local extensions compete with other voice and data calls for tie lines and touch tone receivers, and are queued with other calls, so there may be delays in Message Waiting light updates.

NOTE:

It is recommended that PRI lines, rather than tie lines, be used between MERLIN LEGEND Communications systems in a private network that utilizes the Centralized Voice Mail feature. Refer to Table 1–1, page 1-11 for advantages of PRI lines.

■Similarly, the System G users access its PSTN BRI facilities when they must reach 2B data extensions on other private network systems.