Network Management Features
Issue 5 January 1998 12-5555-230-024
Subnetwork trunking provides digit insertion, deletion, pa uses, and/or wait for
dial tone in digit outpulsing, as required, to permit calls to route to or through a
remote switch, over tie trunks to a private network swit ch, or over central office
trunks to the serving central office.
Generalized Route Selection
Generalized Route Selection gives you the capability to n ot only select the opti-
mal call routing based on the dialed number, but also select the appropriate facil-
ity based on the type of call. Generalized Route Selection en hances Automatic
Route Selection and Automatic Alternate Routing by inco rporating additional
parameters such as the type of call to be used in the decisio n of how a call is
routed.
Different types of calls require the use of different types of facilitie s. For example,
high-speed data calls must use digital facilities, whereas v oice and voice-grade
data calls can use either analog or digital facilities. DEFINITY ECS uses Gen eral-
ized Route Selection to differentiate between these and other types of cal ls and
route them on the appropriate trunks. Based on the call types and available trunk
facilities, voice and data calls may be routed over differ ent trunk types or inte-
grated on the same trunk group. DEFINITY ECS also provides the capability to
route calls based on the data format and the need for restricted or unrestr icted
facilities.
In order to select the appropriate trunking facility for a call, DEFINIT Y ECS must
know the type of call being made. In order to do this, each originating facili ty
such as a telephone or data module has a bearer-capability class assigne d.
Some originating facilities, such as data modules, may hav e multiple bearer-
capability classes. Each trunk group in the routing pattern is assigned a li st of
allowed bearer-capability classes. When a user makes a call, the sy stem queries
the originating facility for its bearer-capability class and then t ries to route the call
on a trunk group with a bearer-capability class that matches the bearer-capability
class of the originating facility. If an exact match is not found, the system then
tries to find a trunk group with a compatible bearer-capability class.
Since the system automatically chooses the right trunk based on the sy stem
administration, the DEFINITY ECS system dial plan can be independent of the
type of call being dialed. This makes life easier for your system users, who do not
have to worry about dialing a different access number for different call type s.
Facility Restriction Level
Facility Restriction Levels are used to limit user call ing privileges for incoming
and outgoing calls. The Facility Restriction Level determ ines if a call attempt is
permitted and which routes can be used or denied in the routing process. Eight
levels of Facility Restriction Levels can be assigned to telephones, computers,