This guide covers the INDeX 20AT telephone when used on an INDeX telephone
system with Software Release 11.0. The 20AT is an analogue telephone for use on
standard telephone lines and on PBX analogue extensions of the INDeX System.
Lamp
Further Help
In all instances, first seek help from your System Manager. They will seek further
assistance from your system's Maintainer if necessary.
System Manager on extension: ...............................................
This guide is also available from our Internet site: http://support.avaya.com
Connecting the 20AT
The 20AT can be connected to most analogue telephone sockets. If connected to a
socket on a private telephone system, check with your System Manager that the
socket is suitable for analogue phones.
• Connect the handset lead to the socket marked H/SET on the base of the 20AT.
• Connect the phone lead from wall socket to the socket marked LINE on the base
of the 20AT.
INDeX 11.0 20AT Telephone User's Guide Introduction – Page 3
38DHB0002UKHB Issue 1 (10/05/2004) Using this Guide
Page 4 - Introduction MF & Time Break Recall operation
MF & Time Break Recall operation
The 20AT uses MF signalling and TB recall signalling only. Contact your telephone
line provider if unsure of the type of signalling you should be using.
During a call, phones can use a recall signal to indicate to the exchange that they
are about to send more digits.
REN Values
To ring properly when a call arrives all phones draw a small current from the
telephone line. All telephone devices have a REN value, a measure of how many
'current units' they need to ring properly.
Most telephone lines can provide ringing current for a total REN of 4. If the total REN
of all the devices on the line exceeds that value, then some of the devices may not
ring when calls arrive.
If it is necessary to connect more devices to a line than it can support, equipment
exists that can increase the total REN provided by the line. Contact your line
provider for details.
• The 20AT has a REN of 1. It can share the same telephone line as other
telephone devices so long as the total REN does not exceed that of the line
(usually 4). INDeX standard telephone sockets provide a REN of 2.
20AT Approvals
The apparatus is approved for connection to the PSTN or suitable PBX supporting
DTMF signalling.
The 20AT has been approved for use of the following facilities:
• DTMF signalling.
• Mute.
• Dual level receive volume control.
Any other usage will invalidate the approval of the apparatus if as a result it then
ceases to comply with the standards against which the approval was granted.
This apparatus is capable of 999/112 calls to the emergency services.
Page 4 - Introduction INDeX 11.0 20AT Telephone User's Guide
MF & Time Break Recall operation 38DHB0002UKHB Issue 1 (10/05/2004)
Redial Last Number 20AT Features – Page 5
20AT Features
Redial Last Number
Pressing the REDIAL key dials out the number of the last manually dialled call.
Changing the Caller Volume
During a call, pressing the VOLUME changes the caller volume between normal and
loud.
Message Waiting Lamp
The 20AT has a voice message waiting lamp. On systems that support message
waiting, the lamp will indicate when a message has been left. The method for
answering the message and clearing the lamp will vary according to the system that
left the message.
For the INDeX system:
To answer a message waiting lamp
1. Lift the handset and dial *1. The system rings the extension that left the
message.
Tocancel a message waiting lamp:
1. Lift the handset and dial *2. Replace the handset.
:
The Memory Key
Recall
The 20AT's MEMORY key can store a single number for quick dialling (ie. lift the
handset and press MEMORY). The number can be up to 21 digits.
Setting the memory number
1. Lift the handset off-hook.
2. Press MUTE and then MEMORY.
3. Dial the number to store.
4. Press MUTE again and replace the handset.
Some telephone systems require a recall signal to initiate special functions (refer to
your System Administrator for details). Press RECALL to send this signal.
INDeX 11.0 20AT Telephone User's Guide 20AT Features – Page 5
38DHB0002UKHB Issue 1 (10/05/2004) Redial Last Number
Page 6 - 20AT Features Mute
Mute
During a call, press MUTE to stop the caller from hearing you without ending the
call. Press MUTE again to reconnect the caller.
Changing the Ringer
You can alter the volume and ring of the 20AT's ringer.
1. Lift the handset off-hook.
2. Press MUTE and then #.
3. Press a key between 0 and 9.
1: Quiet tone ring.
2: Tone ring.
3: Loud tone ring.
4: Quiet normal ring.
5: Normal ring.
6: Loud normal ring (the default setting).
7: Quiet rapid ring.
8: Rapid ring.
9: Loud rapid ring.
0: No Ring (this setting is temporary until the 20AT is next used, then it
returns to its previous setting).
4. Press MUTE again and replace the handset.
Stored Numbers
The 20AT can store 10 numbers for rapid dialling. Each number can be up to 21
digits in length. (Also see page 11 for Storing Personal Speed Dials numbers on the
INDeX system.)
Dialling a stored number
1. Lift the handset off-hook.
2. Press STORE and then the associated store number of the number to dial (0 to
9).
Setting a stored number
1. Lift the handset off-hook.
2. Press MUTE and then STORE.
3. Select the store number to use (0 to 9).
4. Dial the number to be stored.
(Prefix 9 for external users).
5. Press MUTE again and replace the handset.
Page 6 - 20AT Features INDeX 11.0 20AT Telephone User's Guide
Mute 38DHB0002UKHB Issue 1 (10/05/2004)
Introduction INDeX Features – Page 7
INDeX Features
Introduction
When used on an INDeX telephone system, the 20AT has access to a wide range of
system features. This section of the guide covers those features. The 20AT
telephone should only be used in the phone sockets indicated by your System
Manager. It will not work in the sockets used by INDeX 20DS, 20CC, 2010 and
2030/50/60 phones (and vice versa).
Dialling Timeout
Phone Passcode
• Network Features
Your phone system may be part of a network linking several sites. Wherever
possible, it treats network calls as internal calls and offers the same features.
However, this depends on the type of network link and also the type of system
at the other end of the link (ie. some links may be to non-INDeX telephone
systems).
After you start dialling, if you do not dial another digit for several seconds the system
assumes that you have finished dialling. The system then ignores any further digits
that you dial. By default the timeout is 5 seconds, although this varies between sites.
Since it is your phone that generates the audible dialling tones, the system's dialling
timeout does not affect calls connected through the system to services that need to
hear additional MF tones (e.g. Voice mail systems, BT star services, etc).
The requirement to enter your passcode for many of the phone's functions, indicated
by a double-tone, can be switched off by the System Manager. If this is the case
then for non-voice mail functions you can ignore instructions to enter your passcode.
Call Waiting
If, whilst you are engaged on a call, another extension rings your number, you are
notified by a single tone burst that is repeated every 30 seconds. Only you will hear
this tone burst. You can Hold the existing call and answer the waiting call, see page
17 for details.
INDeX 11.0 20AT Telephone User's Guide INDeX Features – Page 7
38DHB0002UKHB Issue 1 (10/05/2004) Introduction
Page 8 - INDeX Features Telephone Tones & Ringing
Telephone Tones & Ringing
The INDeX 20AT uses various tones and ringing to indicate calls and other events.
Incoming Calls:
• Repeated Double Ring: External call.
• Repeated Single Ring: Internal call.
During Calls
• Repeated Single Pip: Another extension is about to intrude or has intruded on your call.
Outgoing Calls:
• Continuous Tone: Number called is unobtainable or set to no calls.
Phone locked, no external calls
(or phone is barred).
• Repeated Tone: Busy number.
• Dial Tone: Dial number.
• Repeated Single Pip: Phone on divert or no calls.
:
Night Service
The system can take different areas into and out of night service automatically. It
does this following timetables setup by the System Manager. The effects of night
service vary, but typically they are as follows:
• Lines: The system directs calls to a night desk number or answer phone
extension.
• Phones: The type of calls you can make becomes more restricted, eg. no
international or long distance calls.
Page 8 - INDeX Features INDeX 11.0 20AT Telephone User's Guide
Telephone Tones & Ringing 38DHB0002UKHB Issue 1 (10/05/2004)
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