Lucent Technologies DEFINITY Enterprise Communication Server Release 8.2 Administrators Guide

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1557 Transfer — Outgoing Trunk to Outgoing Trunk 
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Related topics
n‘‘Feature-Related System Parameters’’ on page 632
— Music on Transferred Trunk Calls field
— Intercept Treatment on Failed Trunk Transfers field
— Abort Transfer
— Transfer Upon Hang-Up
n‘‘Class of Restriction’’ on page 520
— Block Transfer Display field
Transfer — Outgoing Trunk to
Outgoing Trunk
Outgoing Trunk to Outgoing Trunk Transfer (OTTOTT) permits a controlling 
party (such as a station user or attendant) to initiate two or more outgoing trunk 
calls and then connect the trunks. This operation removes the controlling party 
from the connection and conferences the outgoing trunks. Alternatively, the 
controlling party can establish a conference call with the outgoing trunks and then 
drop out of the conference, leaving only the outgoing trunks on the conference.
NOTE:
This is an optional enhancement to Trunk-to-Trunk Transfer and requires 
careful administration and use. Distributed Communication System (DCS) 
Trunk Turnaround may be an acceptable and safer alternative to this feature.
OTTOTT allows calls to be established in which the only parties involved are 
external to the switch and are on outgoing trunks. This type of call can result in 
locked-up trunks, such as trunks that cannot be disconnected except by 
busying-out and releasing the affected trunk circuit. To clear the lockup, a service 
technician must reseat the trunk board, or busy-out and release the affected trunk.
Detailed description
This feature is enabled by administering the Disconnect Supervision Out field to 
y 
on at least one outgoing trunk group screen, and enabling Trunk-to-trunk transfer 
on the Feature Related System Parameters screen. In addition, the network must 
provide answer supervision. The answer supervision test increases the probability, 
but does not guarantee, that a disconnect signal is received from the remote end of 
the trunk. To mitigate problems associated with its accidental use, this feature is 
administrable only on trunk groups on the Trunk Group screen. It is not a system 
option.  
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1558 Transfer — Outgoing Trunk to Outgoing Trunk 
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DCS networks provide a similar but more restrictive version of this feature, called 
DCS Trunk Turnaround, which permits two outgoing trunks to be connected when 
the switch at the remote end of one of the trunks agrees to turn around the logical 
direction of the trunk. DCS trunk turnaround is permitted, when some other party 
involved in the call (at the remote switch) can provide disconnect supervision.
Without OTTOTT or DCS, a conference involving two or more outgoing trunks is 
permitted only when at least one remaining conference party is an attendant, 
incoming trunk, or station.
Considerations
nOTTOTT is not intended for use in DCS networks, since DCS Trunk 
Turnaround provides comparable capabilities much more safely. However, 
use of OTTOTT with DCS is not prohibited, and may be useful when one 
or more of the trunks goes off the DCS network.
Security Measures
!SECURITY ALERT:
This feature can be used to transfer an outside party to a trunk over which 
toll calls might be made, and enabling it poses significant security risks. 
Since trunks have to be specifically administered for OTTOTT, you should 
examine the Class of Restriction (COR) and Facility Restriction Level (FRL) 
of that trunk group to determine if they are appropriate.
!SECURITY ALERT:
OTTOTT is not a system-wide parameter. It is administered on a trunk-group 
basis. You must enable the Trunk-to-Trunk Transfer field on the 
Feature-Related System Parameters screen for this feature to work. If you 
deem that the feature is not relevant to your business practices, do not 
enable it. Alternately, if a temporary need presents itself, you can 
temporarily enable this feature and then turn it off. 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
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Interactions
nDCS Trunk Turnaround
OTTOTT increases the set of cases in which DCS Trunk Turnaround may 
be accepted. However, use of OTTOTT in combination with a DCS 
network is strongly discouraged. The following algorithm describes the 
DCS Trunk Turnaround request process.
a. If any party on the call receives a local-dial, busy, intercept, or 
reorder tone, deny turnaround.
b. If any remaining party is an answered station or attendant, accept 
turnaround.
c. If any remaining party is on an incoming trunk, accept turnaround. 
For the purposes of this check, an outgoing DCS trunk that has been 
turned around an odd number of times via a DCS trunk turnaround 
is considered an incoming trunk with disconnect supervision. 
Similarly, an incoming DCS trunk that has been turned around an 
odd number of times is considered an outgoing trunk.
d. If any remaining party is an outgoing trunk administered for 
OTTOTT that has received answer supervision, accept turnaround.
e. If any remaining party is an outgoing DCS trunk, forward the 
turnaround request.
f. Otherwise, deny turnaround.
nIncoming Disconnect Supervision
Outside of the U.S., incoming disconnect supervision is a switch capability 
that restricts transfers or conferences for certain incoming trunks. In the 
U.S., all incoming trunks are assumed to provide disconnect supervision. In 
some countries this assumption is not valid, so administer whether or not an 
incoming trunk provides disconnect supervision for each trunk group.
nPersonal Central Office Lines
Transfer of personal CO lines (PCOLs) is not subject to the normal 
restrictions applied to transfer of other trunks. These transfers are allowed 
since the PCOL appearance remains on one or more stations as a feature 
button. System users must be aware that the DROP button cannot be used 
to disconnect the transferred-to party from the call. Hence, if an outgoing 
PCOL is transferred to an outgoing trunk and neither of the trunks can 
supply a disconnect signal, the two trunks lock up.
nQSIG Global Networking
If either call is over an ISDN-PRI trunk administered with Supplementary 
Service Protocol b (QSIG), additional call information may display. 
						

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nRelease Link Trunks
RLTs are used by Centralized Attendant Service (CAS). An outgoing RLT 
at a remote branch is used to access an attendant at the main. The attendant 
at the main can transfer the incoming caller to a station or trunk at the 
branch. The RLT is typically used only for a short period of time and is 
usually idled after the transfer is established.
A station at a branch can transfer an outgoing trunk to the attendant at the 
main. This transfer could be viewed as an OTTOTT (the attendant is 
accessed via an outgoing RLT). Since administering outgoing disconnect 
supervision for RLT trunks provides no additional capability, this 
administration is not provided for RLT trunks.
nRestriction
Restrictions on the transferring party may block a transfer or drop 
operation even when Outgoing Disconnect Supervision is provided.
nTrunk-to-Trunk Transfer
If this feature-related system parameter is set to restricted, all 
trunk-to-trunk transfer/release/drop operations for public trunks (CO, CPE, 
CAS, DID, DIOD, FX, and WATS) have calls terminated or receive denial. 
If the parameter is set to none, all trunk-to-trunk transfers (except CAS and 
DCS) have calls terminated or receive denial.
Hence, this option must be set to all to enable OTTOTT operation for these 
types of trunks. The number of public-network trunks allowed on a 
conference call is administrable. This number defaults to 1, so if OTTOTT 
is being used to connect two or more public network trunks, you must 
increase this limit on the Feature-Related System Parameters form.
nTrunks (CO, FX, and WATS)
You cannot have two CO, FX, or WATS trunks in a OTTOTT connection, 
even if the Disconnect Supervision - Out field is set to 
y.
Tra n sfer — Trunk-to-Trunk
Trunk-to-Trunk Transfer allows the attendant or user to connect an incoming 
trunk call to an outgoing trunk. 
!SECURITY ALERT:
Trunk-to-trunk transfer poses a significant security risk. Use this feature 
only with extreme caution. 
The system provides three levels of administration for this feature: system-wide, 
COR-to-COR, and COS.  
						

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Administrator’s Guide  555-233-506  Issue 1
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To administer Trunk-to-Trunk Transfer system-wide, complete the 
Feature-Related System Parameters screen. To restrict Trunk-to-Trunk Transfer 
on a trunk-group basis, assign COR-to-COR calling-party restrictions on the Class 
of Restriction (COR) screen. To allow individual users to control Trunk-to-Trunk 
Transfers, assign capabilities on the Class of Service (COS) screen.
Considerations
nTrunk-to-Trunk Transfer is particularly useful when a caller outside the 
system calls a user or attendant and requests a transfer to another outside 
number. For example, a worker, away on business, can call in and have the 
call transferred elsewhere.
nTransferred trunk calls can be administered to receive either music or 
silence.
nSome central office (CO) trunks do not signal the PBX when the CO user 
disconnects from a call. The system ensures that incoming CO trunks 
without Disconnect Supervision are not transferred to outgoing trunks or to 
other incoming CO trunks without Disconnect Supervision.
nAn attendant-assisted call connecting an outgoing trunk or incoming trunk 
without Disconnect Supervision to an outgoing trunk must be held on the 
console. The system does not allow the attendant to release the call. The 
attendant can, however, use the Forced Release button and disconnect all 
parties associated with the call.
nIf a user has connected two outgoing trunks or an outgoing call and an 
incoming call without Disconnect Supervision, the user must remain on the 
call. Otherwise, the call is dropped. An incoming trunk with Disconnect 
Supervision can be connected to an outgoing trunk without the user 
remaining on the call. An incoming trunk can also be connected to another 
incoming trunk without the user remaining on the call if one of the 
incoming trunks has Disconnect Supervision.
Interactions
nAttendant Lockout
Attendant Lockout does not function on Trunk-to-Trunk Transfer.
nCall Vectoring
Station control of Trunk-to-Trunk Transfer does not affect routing of 
incoming trunks to a VDN that ultimately routes to a destination off-net.
A route to a number off the switch does not require you to enable 
trunk-to-trunk transfer. 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
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nTenant Partitioning
Station control of Trunk-to-Trunk Transfer is prohibited between trunks in 
different tenant partitions if those partitions are restricted.
Trunk Flash
Trunk Flash allows a feature or function button on a multifunction telephone or 
attendant console to be assigned as a Flash button. Pressing this button while 
connected to a trunk (which must have been administered to allow trunk flash) 
causes the System to send a flash signal out over the connected trunk.
Trunk Flash enables multifunction telephones to access central office customized 
services that are provided by the far-end or Central Office (CO) located directly 
behind the DEFINITY System. These central office customized services are 
electronic features, such as conference and transfer, that are accessed by a 
sequence of flash signal and dial signals from the DEFINITY system telephone on 
an active trunk call. The Trunk Flash feature can help to reduce the number of 
trunk lines connected to the DEFINITY switch by:
nPerforming trunk-to-trunk call transfers at the far-end or CO, which 
eliminates the use of a second trunk line for the duration of the call and 
frees the original trunk line for the duration of the call.
nPerforming a conference call with a second outside call party, which 
eliminates the need for a second trunk line for the duration of the call.
NOTE:
Some analog Dual-Tone Multi-Frequency (DTMF) telephone sets 
used in Italy and the United Kingdom are equipped with a FLASH 
button that, when pressed, generates a rotary digit 1. When an analog 
telephone which is administered as a DTMF telephone (for example, 
as a 2500 or 71nn-type telephone) transmits a rotary digit 1, the 
system treats the signal as a recall signal from the telephone set to the 
DEFINITY ECS.
When used by a Centralized Attendant Service (CAS) attendant connected to an 
Release Link Trunk (RLT), the flash controls certain CAS features at the branch. 
When used by a multifunction telephone or non-CAS attendant connected to a 
CO, Foreign Exchange (FX), or Wide Area Telecommutings Service (WATS) 
trunk, the flash controls certain features (such as add-on) at the connected CO.
Trunk Flash is not available on Personal Central Office Line (PCOL) groups.
The system supports the Trunk Flash signal for incoming, outgoing, or 2-way call 
directions on selected 2-wire analog (ground-start or loop-start) or digital (DS1) 
trunks or Tie trunks on DS1. 
						

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If the trunk group is a DS1 trunk in Italy, the Trunk Flash feature applies only to 
outgoing calls.
If the trunk is not directly connected to the far end or CO providing the 
customized services, use of the Trunk Flash signal may cause the call to be 
disconnected by the far end or CO.
Calls made after the Flash are not recorded in Call Detail Recording (CDR) 
records.
Considerations
NOTE:
The Trunk Flash feature allows the telephone user to receive central office 
dial tone, and place a call that is not monitored by the DEFINITY system, 
and is not subject to restrictions (toll, FRL, COR, etc.). Therefore you 
should enable this feature with caution.
nA Trunk Flash button can be assigned on CAS attendant consoles, 
non-CAS attendant consoles, and multifunction telephones. For CAS 
attendants, use of this button is limited to certain CAS features via RLT 
trunks. For multifunction and non-CAS attendant consoles, this button is 
used for the Trunk Flash feature.
nFAC activation of the trunk flash feature is allowed.
nThe Flash button is used by the Trunk Flash and CAS features.
nSystem features (such as internal conference call, transfer, and call park) 
may be combined with custom services (that is, CO-based features that are 
activated/controlled by sending a flash signal over the trunk to the CO). 
However, mixing DEFINITY ECS features with custom services causes 
complications for the user when tracking a call. DEFINITY Systems 
cannot give the local telephone user status information on the custom 
services.
nThe Trunk Flash feature may only be accessed if the call has only one 
trunk, the trunk must be outgoing from the PBX’s perspective, and the 
trunk group of that trunk has Trunk Flash enabled. The Trunk Flash feature 
is disabled when the call involves more than one trunk, even if all the 
trunks have Trunk Flash enabled.
nAny DEFINITY ECS telephone can flash and dial a FAC to access the 
Trunk Flash feature; any DEFINITY ECS telephone with a flash button can 
access the Trunk Flash feature by hitting the flash button. The system 
allows as many as five telephones to participate in a conference call with 
the trunk line party. However, to access the Trunk Flash feature, at least one 
of the telephones must have a Flash button. 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
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Features and technical reference 
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nIn a call involving more than one telephone, one of the telephones may 
press the Flash button, and another telephone may dial the phone number. 
The telephone that dials the phone number is not required to have a Flash 
button.
nIf the far-end/CO does not support custom services, the call may be 
dropped by the far-end/CO on sending the flash signal or the signal may be 
ignored and a click-click sound is heard.
Trunks and Trunk Groups
Trunks connect DEFINITY ECS to other pieces of equipment (adjuncts) and to 
other switches. In general, trunks connect your switch to one of four things:
nthe public telephone network
na private telephone network
nthe Internet or a private intranet
nswitch adjuncts, such as a loudspeaker paging system or a source for music 
or announcements
When trunks of the same type are used for the same application, assign them to 
the same trunk group. A trunk group allows you to assign service characteristics to 
the group rather than administering each trunk individually.
NOTE:
Trunks and access endpoints consume the same resource. The sum of trunks 
and access endpoints cannot exceed the total number of trunks allowed on 
your system.
This chapter contains information about the most common analog and digital 
trunks. Specialized trunks such as Advanced Private-Line Termination (APLT), 
tandem, release-link, and DMI-BOS trunks are not covered in this manual. Refer 
to DEFINITY ECS Administration for Network Connectivity for information on 
these trunks.
Brief description
DEFINITY ECS supports the following basic trunk types.
Access
Used in Electronic Tandem Networks (ETN), access trunks connect satellite 
switches to the main switch. Unlike tandem trunks, access trunks do not carry 
traveling class marks (TCM) and thus allow satellite callers unrestricted access to 
out-dial trunks on the main switch. 
						

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CAMA — Centralized Automatic Message 
Accounting (E911)
CAMA trunks route emergency calls to the local community’s Enhanced 911 
systems and provide Caller’s Emergency Service Identification (CESID) 
information to the system. Public Service Answering Points (PSAP) use CAMA 
trunks to determine the caller’s physical address.
NOTE:
Lucent does not recommend tandeming 911 calls.
When the CAMA feature is administered and a 911 call is placed from a 
DEFINITY ECS station, DEFINITY software searches for the proper CAMA 
Touch-Tone Receiver (TTR) resource in the port network (PN) where the CAMA 
trunk group is located. If the proper CAMA TTR resource is not available in that 
port network, the software checks any other available port networks for the 
CAMA TTR. If none is found in the entire system, a busy tone is returned to the 
calling party. However, if another trunk group is in the same routing pattern as the 
CAMA trunk group, the call routes to the next available trunk group in the pattern. 
For example, if a Central Office (CO) trunk group is used, then any available TTR 
resource can be used and the call routes as a normal call over the CO trunk and the 
public switched telephone network.
E911 systems use CESID information to identify the location of the calling phone. 
The following features can cause incorrect CESID information to be sent with a 
911 call.
Bridged stations
911 calls from a bridged extension will report the CESID of the principle station.
EAS agents
911 calls from an agent in an Expert Agent Selection (EAS) skill will report the 
CESID of the physical station, not the logical agent.
Personal Station Access/Terminal Translation Initialization
When you use Personal Station Access (PSA) or Terminal Translation 
Initialization (TTI) to associate a phone with another extension, the switch will 
report the CESID of the extension — not the physical phone associated with it.
CO — Central Office
CO trunks transmit dialed digits for outgoing calls but not for incoming calls. Use 
CO trunks when you want all incoming calls go to the same destination, such as 
an attendant or a voice menu system. Individual users can place outgoing calls  
						

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without attendant assistance. CO trunks typically connect your switch to the local 
central office, but they can also connect adjuncts such as external paging systems 
and data modules.
CPE — Customer-Provided Equipment
Use CPE trunks to connect adjuncts, such as paging systems and announcement or 
music sources, to the switch.
NOTE:
You can connect some types of equipment to the switch by trunks without 
administering a CPE trunk group. For example, trunk port interfaces can be 
assigned on system screens for Music-on-Hold Access (Feature-Related 
System Parameters screen) or voice and chime paging (Loudspeaker Paging 
and Code Calling Access screen).
DID — Direct Inward Dialing
DID trunks carry incoming calls directly from the local central office to your 
switch. These trunks transmit the digits your switch needs to route incoming calls 
to specific extensions. Use DID trunks when you want people calling your 
organization to dial individual users directly without going through an attendant or 
some other central point.
DIOD — Direct Inward/Outward Dialing
DIOD trunks are two-way trunks that transmit dialed digits in both directions. 
Thus, use DIOD trunks when you want a two-way trunk group with the 
convenience of direct inward dialing for incoming calls. DIOD trunks are used 
mostly outside North America, and typically they connect the switch to a local 
central office.
In North America, use tie trunks for applications that require two-way 
transmission of dialed digits. In the U.S., trunks that transmit digits in both 
directions are sometimes called “smart trunks” and are administered as T1 tie 
trunks. 
FX — Foreign Exchange
An FX trunk is essentially a CO trunk that connects your switch directly to a 
central office outside your local exchange area. Use FX trunks to reduce long 
distance charges if your organization averages a high volume of long-distance 
calls to a specific area code.