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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Call-Handling Scenarios
Page 2-7Networking Guidelines
2
must be prepended. Furthermore, users on your system dial only four digits to
reach remote extensions while DEFINITY ECS or DEFINITY ProLogix Solutions
users dial five digits for intercom calls within their local systems, so extension
numbering is not consistent across the private network.
When a private network includes a DEFINITY ECS or DEFINITY ProLogix
Solutions system, it is recommended that the MERLIN LEGEND Communications
Systems in the private network use 4-digit extension numbers in their local dial
plans. One reason is that DEFINITY ECS and DEFINITY Prologix Solutions
systems cannot dial anything less than a 4-digit extension number. If a DEFINITY
ECS or DEFINITY ProLogix Solutions system is the hub and uses 5-digit
extension numbers, calls can be more easily routed through it to reach MERLIN
LEGEND Communications System extension numbers that are four digits long. If
the MERLIN LEGEND Communications System extension numbers are three
digits long, there are more potential numbering conflicts. For example, if a
MERLIN LEGEND Communications System extension number range is 220–249,
it can conflict with a very large range of DEFINITY ECS or DEFINITY ProLogix
Solutions system extension numbers, 22000–24999. Furthermore, 4-digit
numbering provides more room for growth and for easy routing to different types
of extensions in a MERLIN LEGEND Communications System, without the need
for system renumbering of the local dial plan.
When planning for centralized VMS/AA, keep in mind that the DEFINITY ECS and
DEFINITY ProLogix Solutions systems cannot send coverage or overflow calls to
a VMS/AA on a MERLIN LEGEND system, and a MERLIN LEGEND system
cannot send coverage or overflow calls to a DEFINITY system’s VMS/AA. The
automated attendants on both systems can transfer calls to extensions on the
other system. The position of the DEFINITY system within the private network
may also affect the ability of MERLIN LEGEND systems to use a centralized
VMS/AA. Only a MERLIN LEGEND system directly connected by tandem trunks
to the MERLIN LEGEND system where the centralized VMS/AA is installed can
send calls to the centralized VMS/AA.
Automatic Route Selection (ARS) 2
Local system users may use ARS to route calls over tandem trunks to the PSTN
facilities connected to a remote system.
This arrangement can provide toll cost savings when users need to reach outside
numbers that are
not
in their own local calling area but
are
local to other systems
in a private network. It also means that in some cases, a MERLIN LEGEND
Communications System may have only one or two PSTN trunks connected to it
for emergency purposes only. Under normal circumstances, the system uses
PSTN facilities connected to another system in the private network, which can
provide call-volume advantages when buying PSTN services such as domestic
long-distance calling. The scenarios later in this chapter provide examples.