Lucent Technologies DEFINITY Enterprise Communications Server Release 8.2 Overview Manual

							DEFINITY Enterprise Communications Server Release 8.2
Overview  555-233-002  Issue 1
April 2000
System Management Features 
81 Trunk Management 
necessary to put several ISDN-PRI narrowband channels into one wideband channel to 
accommodate the needs of these applications. This feature supports both European and 
North American standards.
Multiple Subscriber Number (MSN) - Limited
The ISDN standard MSN feature lets customers assign multiple extension to a single BRI 
endpoint. The MSN feature works with BRI endpoints that allow the Channel ID IE to be 
encoded as “preferred.”
Automatic TEI (Termination Endpoint Identifier)
The user side will support automatic TEI assignment by the network. Both fixed and 
automatic TEI assignment will be supported on the network side.
ATM-CES Trunks
ATM-CES (Circuit-Emulation Service) lets the DEFINITY ECS emulate an ISDN-PRI 
trunk on an ATM facility.
ATM Trunks
Support telephony and Wide-Area Network (WAN) connectivity over ATM networks.
Personal Central Office Line (PCOL)
Provides a dedicated trunk circuit between multi-appearance voice terminals and a CO or 
other switch via the network.
ISDN Presentation Restriction
Replaces Presentation Restricted or Unavailable Calling/Connected number with an 
administered text for display. The administration options can be controlled on a 
per-ISDN-Trunk-Group basis. 
ISDN Feature Plus
Enables those without DID to direct dial users on a remote PBX via the public network. 
ISDN Feature Plus eliminates the need for Attendant intervention for those without DID 
capabilities. 
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							System Management Features 
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DEFINITY Enterprise Communications Server Release 8.2
Overview  555-233-002  Issue 1
April 2000
Tandem
In an Electronic Tandem Network, DEFINITY ECS provides a variety of features on a 
network-wide basis. Here are a few examples:
nUniform Dial Plan (UDP) — A unique four- or five-digit number assigned to each 
station on the network. Uniform numbering gives each station a unique number 
(location code plus extension) that can be used at any location in the Electronic 
Tandem Network to access that station, DEFINITY ECS enhances the standard 
UDP with the unrestricted 5-digit Uniform Dial Plan, which allows up to five digits to 
be parsed for call routing.
nExtension Number Portability — When employees move within the network, they 
can retain their extension numbers. The ability to keep extension numbers, and 
even Electronic Tandem Network and Direct Inward Dialed numbers, when moving 
to other locations within the company eliminates missed calls and saves valuable 
time.
nTraveling Class Marks — Traveling Class Marks are a mechanism for passing a 
caller’s facility restriction level from one Extended Tandem Network switch to 
another. Traveling Class Marks allow privilege checking to be passed across 
switches through the Electronic Tandem Network.
nAutomatic Alternate Conditional Routing — You can control the routing of particular 
calls using conditional routing. For example, you can limit the number of 
communications satellite hops (communications satellite links used as trunks) in 
any end-to-end private network routing pattern. Limiting the number of satellite 
hops may be desirable for controlling transmission quality or call delay in both voice 
and data calls.
nEnhanced Trunk Signaling and Error Recovery — The reliability of Electronic 
Tandem Network calls is improved by allowing a trunk call to be retried on another 
circuit when signaling failures occur.
tandem switch: A switch within an electronic tandem network (ETN) that provides the 
logic to determine the best route for a network call, possibly modifies the digits outpulsed, 
and allows or denies certain calls to certain users.
tandem through: The switched connection of an incoming trunk to an outgoing trunk 
without human intervention.
tandem tie-trunk network (TTTN): A private network that interconnects several 
customer switching systems.
See also, ‘‘ATM-Port Network Connectivity (ATM-PNC)’’ on page 107.
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							DEFINITY Enterprise Communications Server Release 8.2
Overview  555-233-002  Issue 1
April 2000
System Management Features 
83 Trunk Management 
Digital Multiplexed Interface
Supports two signaling techniques: bit-oriented signaling and message-oriented signaling 
for direct connection to host computers.
Digital Multiplexed Interface offers two major advantages. It delivers a standard, 
single-port interface for linking host computers internally and externally via T1 carrier. 
And, since it is compatible with ISDN standards and is licensed to numerous equipment 
manufacturers, it promotes multi-vendor connectivity.
DEFINITY ECS supports two versions of Digital Multiplexed Interface, each differing in 
the way information is carried over the 24th channel:
nDigital Multiplexed Interface-Bit-Oriented Signalling carries framing and alarm data 
and signalling information for connections to host computers and other vendor 
equipment.
nDigital Multiplexed Interface Message-Oriented Signalling, fully compatible with 
ISDN-PRI, uses the same message-oriented signalling format, Link Access 
Procedure on the D-channel, as ISDN-PRI for control and signalling. These 
signalling capabilities extend the advantages of Digital Multiplexed 
Interface-Message Oriented Signalling multiplexed communications to the public 
ISDN network.
Miscellaneous Trunks
Miscellaneous trunks perform functions that do not fit neatly into any of those already 
described:
nRelease-link trunks are used between switch locations to provide Centralized 
Attendant Service or Automatic Call Distribution group availability.
nRemote-access trunks provide off-premises users with access to DEFINITY ECS 
features and networking.
Digital Interfaces
E1 Interface
DEFINITY ECS also supports E1 connections. T1/E1 access and conversion allows 
simultaneous connection to both T1 (1.544 Mbps) and E1 (2.048 Mbps) facilities (using 
separate circuit packs).
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DEFINITY Enterprise Communications Server Release 8.2
Overview  555-233-002  Issue 1
April 2000
T1 Interfaces
When planning your networking requirements, one of the options you should consider is 
multiplexing over Digital Services 1 (DS1) facilities.
Used to connect switches to the public network or to other switches in a private network, 
DS1 also delivers high-speed, end-to-end digital connectivity. Voice and data calls are 
completed at transmission speeds of up to 64 kbps.
DS1 Trunk Service
Bit-oriented signaling that multiplexes 24 channels into a single 1.544-Mbps stream. DS1 
can be used for voice or voice-grade data and for data-transmission protocols. E1 trunk 
service is bit-oriented signaling that multiplexes 32 channels into a single 2.048-Mbps 
stream. Both DS1 and E1 provide a digital interface for trunk groups.
Answer Detection
For purposes of Call-Detail Recording (CDR), it is important to know when the called 
party answers a call. DEFINITY ECS provides three ways to determine whether the far 
end has answered an outgoing call. 
nAnswer Detection — A call-classifier board detects tones and voice-frequency 
signals on the line and determines whether a call has been answered. This method 
is fairly accurate. 
nNetwork Answer Supervision- The Central Office (CO) sends back a signal to 
indicate that the far end has answered. If a call has traveled over a private network 
before reaching the CO, the signal is transmitted back over the private network to 
the originating system. This method is extremely accurate, but is not available in 
the United States over CO, FX, or WATS trunks. 
nAnswer Supervision by Time-out — You set a timer for each trunk group. If the 
caller is off-hook when the timer expires, the DEFINITY ECS assumes that the call 
has been answered. This is the least accurate method. Calls that are shorter than 
the timer duration do not generate call records, and calls that ring for a long time 
produce call records whether they are answered or not. 
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							DEFINITY Enterprise Communications Server Release 8.2
Overview  555-233-002  Issue 1
April 2000
System Management Features 
85 Automatic Routing Features 
Automatic Transmission Measurement System
Measures voice and data trunk facilities for satisfactory transmission performance. The 
measurement report contains data on trunk signal loss, noise, signaling return loss, and 
echo return loss. Acceptable performance, the scheduling of tests, and report contents 
are administrable.
Automatic Routing Features
DEFINITY ECS provides a variety of automatic-routing features for public and private 
networks. Automatic Alternate Routing (AAR) and Automatic Route Selection (ARS) are 
the foundation for these automatic-routing features. They route calls based on the 
preferred (normally the least expensive) route available at the time the call is placed. 
Generally, AAR routes calls over a private network and ARS routes calls using the public 
network numbering plan. However, both AAR and ARS support public and private 
networks. You can use the other features listed in this section when you use AAR and 
ARS.
Automatic Alternate Routing (AAR)
Allows private network calls to originate and terminate at one or many locations without 
accessing the public network. When you dial an access code and phone number, AAR 
selects the most desirable route for the call and performs digit conversion as necessary. If 
the first choice route is unavailable, another route is chosen automatically.
The numbers you call using AAR are normally private-network numbers. However, you 
can call a public-network number, a service code, an international number, operator 
access code, or an operator-assisted dialing number. With AAR and Subnet Trunking, 
you have a convenient way to place international calls to frequently-called foreign cities. 
Such calls route as far as possible over the private network, and then access the public 
network. This saves toll charges and allows you to use your private network as much as 
possible.
Automatic Route Selection (ARS)
ARS selects carriers automatically and routes calls inexpensively over the public network. 
When there are one or more long-distance carriers and Wide-Area Telecommunications 
Services (WATS) provided, DEFINITY ECS selects the most preferred route for the call. 
Long-distance carrier-code dialing is not required on routes selected by the system. You 
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							System Management Features 
86 Automatic Routing Features 
DEFINITY Enterprise Communications Server Release 8.2
Overview  555-233-002  Issue 1
April 2000
assign long-distance carrier-codes and DEFINITY ECS translates them. The system 
inserts codes as needed to guarantee automatic-carrier selection. ARS can route calls to 
a variety of types-of-numbers and access a variety of types of trunk groups.
AAR/ARS Overlap Sending
DEFINITY ECS supports overlap sending for AAR and ARS calls that are routed over 
ISDN-PRI trunk groups. ISDN-PRI call-address information is sent one digit at a time 
instead of in one block. In countries with complex public-network numbering plans, this 
allows for a significant decrease in call setup time. When overlap receiving is enabled, 
this is especially significant for tandemed calls.
AAR/ARS Partitioning
Allows AAR and ARS to be partitioned into 8 user groups within a single DEFINITY ECS 
and provides individual routing treatment for each of these user groups.
User groups share the same Partition Group Number, which indicates the choice of 
routing tables that are used on a particular call. Each Class of Restriction (COR) is 
assigned a specific Partition Group Number or Time of Day specification. Different 
classes of restriction may be assigned the same Partition Group Number.
Time of Day Routing
Provides the most economical routing of ARS and AAR calls. This routing is based on the 
time of day and day of the week that each call is made. Up to 8 TOD routing plans may be 
administered, each scheduled to change up to 6 times a day for each day in the week.
This allows you to take advantage of lower calling rates during specific times of the day 
and week. In addition, companies with locations in different time zones can use different 
locations that have lower rates at different times of the day or week. This feature is also 
used to change patterns during the times an office is closed in order to reduce or 
eliminate unauthorized calls.
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							DEFINITY Enterprise Communications Server Release 8.2
Overview  555-233-002  Issue 1
April 2000
System Management Features 
87 Automatic Routing Features 
Facility Restriction Levels
and Traveling Class Marks
Allows certain calls to specific users, while denying the same calls to other users. For 
example, certain users may be allowed to use Central Office trunks to other corporate 
locations while other users may be restricted to less expensive private-network lines. You 
can administer up to eight levels of restriction for users of AAR and ARS.
Alternate Facility Restriction Levels 
Allows DEFINITY ECS to adjust facility restriction levels or authorization codes for lines or 
trunks. Each line or trunk is normally assigned a facility restriction level. With this feature, 
Alternate Facility Restriction Levels are also assigned. Attendants can change to the 
alternates, thus changing access to lines and trunks. You might want to use this feature to 
disable most long-distance calling at night, for example, to prevent unauthorized staff 
from making long-distance calls.
!CAUTION:
This feature may change the AAR and ARS routing preferences. Using it on 
tandem and tie-trunk applications affects entire networks. Calls that are part of a 
cross-country private network may be blocked.
Generalized Route Selection
Provides voice and data call-routing capabilities. You use it to select not only the 
least-cost routing, but also optimal routing over the appropriate facilities. It enhances AAR 
and ARS by providing additional parameters in the routing decision and maximizing the 
chance of using the right facility to route the call. Also, if an endpoint incompatibility 
exists, it provides a conversion resource (such as a modem from a modem pool) to 
attempt to match the right facility with the right endpoint.
Look-Ahead Routing
Provides an efficient way to use trunking facilities. It allows you to continue to try to 
reroute an outgoing ISDN-PRI call that is not completing. When DEFINITY ECS receives 
a cause value that indicates congestion, Look-Ahead Routing tells the system what to do 
next. For each routing preference, you can indicate if the next routing-preference should 
be attempted or if the current routing-preference should be attempted again.
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DEFINITY Enterprise Communications Server Release 8.2
Overview  555-233-002  Issue 1
April 2000
Subnet Trunking
Modifies the number you dial so an AAR or ARS call can route over different trunk groups 
that may terminate in switches with different dial plans. Subnet Trunking inserts digits, 
deletes digits, pauses, and/or waits for dial tone in digit outpulsing, as required, so calls 
route:
nTo or through a remote switch
nOver Tie trunks to a private network switch
nOver CO trunks to the serving CO
Subnet Trunking is required on calls routing to or through a remote switch, regardless of 
the call’s destination.
Extension Number Portability
Gives you the ability to assign any extension to any system in a subnetwork. Stations can 
be moved across systems while retaining the original extension number, as long as the 
systems are part of a defined subnetwork. This feature is used in conjunction with 
Automatic Alternate Routing and Uniform Dial Plan. 
Alarm Assignments
Alternate Operations Support System Alarm
Number
Allows you to establish a second number for the DEFINITY ECS to call when an 
alarmable event occurs. This feature is useful for alerting a second support organization, 
such as INADS or OneVision.
External Device Alarming
Allows you to assign analog ports to alarm interfaces for external devices. You can 
specify a port location, information to identify the external device, and the alarm level to 
report when a contact closure occurs. 
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							DEFINITY Enterprise Communications Server Release 8.2
Overview  555-233-002  Issue 1
April 2000
System Management Features 
89 Alarm Assignments 
Customer-Provided Equipment Alarm
Provides you with an indication that a system alarm has occurred and that the DEFINITY 
ECS has attempted to contact a service organization. A device that you provide, such a 
lamp or a bell, is used to indicate the alarm situation. You can administer the level of 
alarm about which you want to be notified.
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							System Management Features 
90 Alarm Assignments 
DEFINITY Enterprise Communications Server Release 8.2
Overview  555-233-002  Issue 1
April 2000
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