Lucent Technologies DEFINITY Enterprise Communications Server Release 8.2 Instructions Manual

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AT&T Switched Network Protocol
DEFINITY ECS supports the AT&T Switched Network Protocol described in the 
TR41449 (for 4ESS to common carrier) and TR41459 (for 5ESS to CO) ISDN 
protocol standards as defined by AT&T. This protocol is used when the DS1 
circuit pack is administered for Country Code 1, Protocol Version a. The AT&T 
Switched Network provides you with the following services.
Access to AT&T Switched Network Services 
ISDN provides access to AT&T Switched Network Services. The definition of the 
Service Type field on the ISDN Trunk Group screen includes a table that outlines 
these switched-network services. An ISDN trunk group may be dedicated to a 
particular feature. Alternately, an ISDN call-by-call trunk group may provide 
access to several features. For a description of the services accessible via ISDN 
(either via dedicated or call-by-call trunk groups), refer to ‘‘
Call-by-Call Service 
Selection’’ on page 1305.
Figure Notes
1. DEFINITY ECS
2. ISDN trunk3. Public switched network
4. Host computer 
						

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Call Identification Display
ISDN Call Identification Display provides a transparent name and number display 
for all display-equipped telephones within an ISDN network. The feature is 
transparent in that the same information can be provided at all ISDN facilities. 
Telephones using this feature should be digital telephones with a 40-character 
alphanumeric display. The Merlin hybrid sets with 32-character displays (7315H 
and 7317H) also support this feature.
ISDN Call Identification Display is provided in addition to the normal Telephone 
Display and Attendant Display features when the network supports end-to-end 
ISDN connectivity. When both ISDN and DCS display information are received, 
the switch can display either the DCS or ISDN call identification information. If 
only ISDN display information is received, information displays in ISDN format.
The display fields that may be used for ISDN are: Name, Number, Miscellaneous 
Call Identification, and Reason for Call Redirection. The display information 
varies, depending on the type of call, how the call is handled (for example, 
whether it is redirected or not), and the information is available on the call. 
CPN/BN to Host Call Identification
The CPN/BN to Host Call Identification enables CPN and BN information to be 
passed from the switch to the ISDN Gateway, so that the ISDN Gateway can 
forward the information to a host for data-screen delivery to agents in an ACD 
split.
By delivering call-identification information such as CPN/BN and switch 
information such as the answering-agent’s extension to an adjunct network (ISDN 
Gateway), the adjunct automatically delivers data screens to agents for new calls 
and call transfers.
The figure below shows a simplified diagram of a CPN- and BN-to-host 
arrangement. The ISDN Gateway is a UNIX or MSDOS computer connected to 
the switch on one side and to a host computer on the other side. The connection to 
the switch is over a synchronous interface with BX.25 protocol. 
						

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Private network services 
In addition to providing access to switched-public networks, ISDN provides 
private-network services by connecting DEFINITY ECS in an Electronic Tandem 
Network (ETN), Distributed Communications System (DCS), or QSIG Network. 
This gives you more efficient private networks that support new integrated voice 
and data services. ETN, DCS, and QSIG networking services are provided as 
follows.
ETN services
DEFINITY Enterprise Communication Servers that function as tandem nodes in 
an ETN can be interconnected using DS1 trunking facilities with ISDN. All 
signaling between the tandem switches is done with ISDN D-channel and normal 
ISDN protocol. The ISDN can also be used to connect ETN tandem and main 
switches. In this case, the main switch collects all of the address digits from local 
users as well as users at other satellite and tributary switches, and originates a call 
over ISDN to the tandem switch.
Figure Notes
1. ISDN trunk
2. SID/ANI
3. DEFINITY ECS
4. BX.25
5. ISDN Gateway6. Existing interface
7. Host computer
8. Telephone
9. ACD agent position
10. Data terminal
r781861 CJL 060996 
						

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Automatic Alternate Routing (AAR) and Automatic Route Selection (ARS) are 
used with ISDN and DS1 trunking facilities to access ETN facilities. AAR and 
ARS are used to collect the dialing information for the call that is originated from 
the main switch.
DCS services
ISDN-PRI facilities can be used in a DCS arrangement whenever tie trunks are 
used to connect the DCS nodes. Most DCS features are not affected by ISDN-PRI. 
However, there is a minor impact on a few of the DCS features, as far as the 
functions that the local and remote switches perform. 
QSIG services
QSIG networking provides compliance to the International Organization for 
Standardization (ISO) ISDN private-networking specifications. The QSIG 
Networking platform is supported over the ISDN Basic Call setup protocol. 
DEFINITY ECS supports QSIG Supplementary Services. 
Wideband Switching (ISDN-PRI only)
Wideband Switching provides support for services that require large bandwidth, 
such as high-speed video conferencing. Wideband also supports multiple channel 
calls end-to-end. These services have traditionally been handled by dedicated 
facilities. With Wideband Switching, dedicated facilities are no longer a 
requirement for these large bandwidth services.
Call-by-Call Service Selection 
Call-by-Call Service Selection allows the same ISDN trunk group to carry calls to 
a variety of services or facilities. Embodied in this feature is the ability to allocate 
usage. It provides significant flexibility for creating user-defined incoming and 
outgoing services and is used on any ISDN trunk group.
Access to Software Defined Data Network 
With ISDN, the SDDN service may be accessed. SDDN provides virtual 
private-line connectivity via the switched public network. The services provided 
by SDDN include voice, data, and video applications. SDDN services 
complement the ISDN voice services.
Access to Switched Digital International
Switched Digital International (SDI) provides 64 kbps of unrestricted connectivity 
to international locations via the AT&T Switched Network. It is also the backbone 
for the AT&T International ISDN network. SDI complements the ACCUNET 
digital service already available to United States locations. This service can be 
accessed using Call-by-Call Service Selection. SDI provides economical 
high-speed data transfer to international locations. 
						

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National ISDN-2 Services
DEFINITY ECS supports National ISDN-2 (NI-2), which offers many of the 
same services as the AT&T Switched Network protocol. The NI-2 protocol is used 
when the DS1 circuit pack is administered for Country Code 1, Protocol 
Version b. 
NI-2 provides users with the following services:
nCalling Line Identification
nNon-Facility Associated Signaling (ISDN-PRI only)
nD-Channel Backup (ISDN-PRI only)
nWideband Switching (ISDN-PRI only)
nCall-by-Call Service Selection
Calling Line Identification
Calling Line Identification for NI-2 is essentially Calling Party Number (CPN) 
identification, as previously described.
Non-Facility Associated Signaling (ISDN-PRI only)
Non-Facility Associated Signaling (NFAS) allows an ISDN-PRI T1 or E1 
Interface D-channel (signaling channel) to convey signaling information for 
B-channels (voice and data) on ISDN-PRI T1 or E1 facilities other than the one 
containing the D-channel. See ‘‘
Facility and Non-Facility Associated Signaling’’ 
on page 1342 for more information.
D-Channel Backup (ISDN-PRI only)
D-Channel Backup is provided to improve reliability in the event of a 
signaling-link failure. See ‘‘
Facility and Non-Facility Associated Signaling’’ on 
page 1342 for more information.
Wideband Switching (ISDN-PRI only)
Wideband Switching for NI-2 is essentially the same as that of the AT&T 
Switched Network ISDN-PRI protocol.
Call-by-Call Service Selection
Call-by-Call Service Selection for NI-2 is essentially the same as that for the 
AT&T Switched Network ISDN-PRI protocol. 
						

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ISDN interworking 
ISDN interworking allows calls to use a combination of both ISDN and non-ISDN 
trunking and station facilities. A non-ISDN trunking facility is any trunk facility 
supported by the system that does not use the ITU-T recommended Q.931 
message set for signaling. Non-ISDN trunking facilities include facilities such as 
analog trunks, AVD DS1 trunks, and DS1 trunks with bit-oriented signaling 
(robbed-bit or common channel).
DEFINITY ECS supports the conversion of ISDN signaling to non-ISDN in-band 
signaling and the conversion of non-ISDN in-band signaling to ISDN signaling 
for interworking purposes.
A mixture of ISDN and non-ISDN signaling is required in order to provide 
end-to-end signaling when using different types of trunk or station facilities on a 
call. See the figure below for an example of interworking. 
In this example, a call for someone at Switch B comes into Switch A. 
Interworking allows the ISDN signaling of the call to be converted at Switch A to 
non-ISDN in-band signaling before the call forwards to Switch B. Even though 
the call comes into Switch A on an ISDN trunk, Switch A can send the call to 
Switch B over a non-ISDN trunk by converting the signaling information.
The system provides accurate CDR billing information on calls that are not 
interworked. Accuracy of CDR billing information on interworked calls is 
equivalent to the accuracy provided by the public network.
DEFINITY ECS supports sending a non-ISDN trunk name as the connected 
name. Therefore, a non-ISDN trunk name can be sent as the connected name even 
when a call starts out as an ISDN call but is interworked over non-ISDN trunks.
Figure Notes
1. Call from network to Switch B
2. ISDN trunk
3. Switch A4. Non-ISDN trunk
5. Switch B 
						

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Call Identification Display
Two types of identification numbers are provided with ISDN and may be used in 
the various types of displays used with ISDN. The two types of identification 
numbers are as follows:
nCalling Party Number (CPN): A 0–15 digit DDD number associated with a 
specific station. When a system user makes a call that uses ISDN, that 
user’s CPN is provided by the system for ISDN. ISDN public-unknown 
numbering or ISDN private numbering forms are administered to create a 
0–15 digit CPN from a local station number.
nBilling Number (BN): The calling party’s billing number, which is 
provided to an inter-exchange network via Equal Access or Centralized 
Automatic Message Accounting (CAMA). This number is stored at either a 
local or network switch. If a customer is connected directly to the AT&T 
Switched Network, the BN is the customer’s billing number stored in that 
network. If the CPN is not provided on an incoming ISDN call, the network 
uses the BN for the station identification number.
The following types of display information are provided with ISDN:
nCalling Party’s Number
The calling party’s number appears on the called party’s display. This 
number is provided only if the outgoing ISDN trunk group is administered 
to send the CPN, and if ISDN public-unknown numbering or ISDN private 
numbering forms are administered to create a CPN. On calls incoming to a 
system, the network may provide either the CPN or BN as the calling 
party’s number. Extensions and 12-digit international numbers display 
without dashes. Dashes are only used for 7-digit and 10-digit numbers 
when North American Area Code is enabled on the Dial Plan screen.
nCalling Party’s Name
The calling party’s name appears on the called party’s display. On calls 
generated from a DEFINITY ECS, the caller’s name is provided if the 
ISDN trunk group is administered to send the name to the network. On 
calls incoming to a DEFINITY ECS, the (public or private) network may 
provide the caller’s name. If the caller’s name is not available, the called 
party’s display shows “CALL FROM” instead, followed by the calling 
party’s number (if available).
nConnected Party’s Number
The connected party’s number appears on the caller’s display. On calls 
generated from a DEFINITY ECS, callers’ displays may show the digits 
dialed as the call is made. If the (public or private) ISDN network provides 
the connected party’s number, the calling party’s display is updated to show 
the connected party’s number. The format of the connected party’s number 
is the same as that of the calling party’s number described previously on  
						

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calls incoming to a DEFINITY ECS. The 0–15 digit number of the party 
who answers the call is provided to the ISDN network only if the incoming 
ISDN trunk group is administered to send connected number to the 
network and ISDN public-unknown numbering or ISDN private numbering 
forms are administered to create a CPN.
NOTE:
The connected party may be the party actually called, in the event the 
call is transferred before the connected party answers the call.
nConnected Party’s Name
The connected party’s name appears on the calling party’s display. On calls 
generated from a DEFINITY ECS, the (public or private) ISDN network 
may provide the connected party’s name to the DEFINITY ECS, when the 
call is answered. If the connected party’s name is not available, the calling 
party’s display shows ANSWERED BY, followed by the connected party’s 
number (if available).
On calls incoming to a DEFINITY ECS, the connected party’s name is 
provided if the incoming ISDN trunk group is administered to send the 
name to the network.
Depending on how the switches involved in a call are configured, parties may see 
none, some, or all the information described above.
Displays for redirected calls
Features such as Call Coverage, Call Forwarding All Calls, Bridged Call 
Appearance, or Call Pickup redirect calls from the called party’s extension to 
some other destination. Once the redirected call has been connected at its new 
destination, the displays for the calling, called, and connected parties are as 
follows:
— Calling Party Display
a= CONNECTED NAME   CONNECTED NUM     MISCID
— Called Party Display
This is the display of the party the caller originally dialed. If this party 
bridges onto the redirected call after it has been answered, they see:
a= CONFERENCE 2
In this situation, the connected party’s display (see below) shows the same 
information. The calling party’s display is also updated if the calling and 
called parties are on the same switch. 
						

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— Connected Party Display
The connected party is the party who answers the redirected call. 
a= CALLING ID    to    CALLED ID          R
The R indicates the reason for redirection. The CALLING ID and the 
CALLED ID may be the name or the number, depending on the 
information received from the far end.
Displays for conference calls
Both terminal and attendant conference calls are identified as calls with “n” 
number of conferees. This display information generates locally and does not 
change the display on another switch. If the conference call eventually drops back 
to a two-party call, the original display information is restored. However, when 
two DCS and/or ISDN calls (or any possible combination of each) are 
conferenced and revert to a two-party call, the trunk group of the remaining call 
displays.
Displays for calls to hunt groups
On ISDN calls to a hunt group extension, the caller’s display identifies either the 
name of the hunt group or the name of the group member who answers the call, 
depending on hunt group administration.
Displays for calls to Terminating Extension Groups (TEG)
On ISDN calls to a TEG, the caller’s display identifies either the group or the 
group member who answers the call, depending on administration.
Caller Information Forwarding
With CINFO you can use a vector collect digits step to retrieve caller entered 
digits (ced) and customer database-provided digits (cdpd) supplied by the network 
in an incoming call’s ISDN SET UP message. ISDN is required if the CINFO 
comes from the network.
Facility Restriction Level and Traveling Class 
Mark
The TCM used to pass on the originating facility’s FRL is sent by ISDN facilities 
in the SETUP message only if the trunk services type is tandem.
Information Indicator Digits (II-digits)
With II-digits you can make vector-routing decisions based on the type of the 
originating line. II-digits are provided for an incoming call by ISDN-PRI. It is a 
generally available ISDN AT&T Network service. 
						

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Malicious Call Trace (MCT)
ISDN calling number identification is sent when MCT notification is activated on 
an ISDN trunk. 
Multiple Subscriber Number (MSN) - Limited
The ISDN standard MSN feature lets you assign multiple extensions to a single 
BRI endpoint. A side effect of supporting the NT interface is the MSN feature 
works with BRI endpoints allowing the Channel ID IE to be encoded as 
“preferred.” The endpoint must be administered as the far end of an NT-side 
ISDN-BRI trunk group. Also, you must use the Uniform Dial Plan (UDP) feature 
to assign the desired extensions to the “node” at the far end of the trunk group.
Overlap Sending
You can administer overlap sending on AAR and ARS calls routed over ISDN 
trunk groups. This allows you to send and receive digits one digit at a time instead 
of enbloc. (With enbloc, digits are not sent until the entire group of digits is 
received).
Interactions
nAustralia Malicious Call Trace
A DEFINITY ECS with a BRI connection to the Australian public network 
is able to notify the network if a user in a private network invokes the 
Malicious Call Trace feature. This works on Australian national 
connections.
nDirect Inward Dialing
Some public network operators may not offer full Direct Inward Dialing 
service on BRI trunks, but instead may offer the BRI equivalent, which 
typically is called Multiple Subscriber Number (MSN). This is the case if 
the public network treats the BRI as an endpoint interface rather than a 
trunk group interface.
In such a case, the network only routes up to 10 public numbers to a 
particular pair of BRI trunks. Furthermore, the network may not let calls 
overflow from one BRI trunk to another.
nD-Channel Backup
D-Channel Backup is not supported on BRI connections.