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Preparing to use your 
Delta 820 

 
INITIAL CHECK 
Our telephones are checked, tested and leave us in 
perfect condition. If yours is damaged, please return 
it to your supplier with proof of purchase, for a 
replacement. 
 
CONNECTION 
The Delta 820 telephone can be connected either to 
a Direct Exchange Line, or as an extension to a 
compatible company exchange (PABX). 
 
HANDSET CORD 
This cord will require connection between the 
telephone and handset. Take any end of the 
handset cord, locate the port on the left hand side of 
the Delta 820 and simply push to locate. Connect 
the other end to the base of the handset to 
complete. 
 
LINECORD 
The Delta 820 arrives with a linecord for connection 
to a standard BS6312 BT-socket. The line socket 
can be found on the rear of the telephone, plug your 
linecord into this port first and the other end to your 
telephone line termination point. 
 
An RJ11 or an RJ45 linecord are available as an 
option, ask your supplier for details. 

 

Using your Delta 820 with 
the Handset 

 
RECEIVING CALLS 
Incoming calls will be announced by the audible 
ringer and flashing LED. To answer the call, simply 
lift the handset. 
 
ADJUSTING YOUR RINGER VOLUME 
The ringer volume is controlled by a 2 position 
switch located at the rear of the telephone and 
indicated by a picture of a bell. 

 

 

 
MAKING A CALL VIA THE HANDSET 
Pick up the handset and listen for dial tone 
Dial the required telephone number 

(Note: making external calls from a company 
exchange (PABX) may require the number to be 
prefixed by an access digit, normally ‘9’). 

 
 

Using your Delta 820 with 
Hands Free 

 
Whether it’s having both hands available, or 
conference calling with colleagues, the 
speakerphone feature of the Delta 820 is seen by 
many as a valuable benefit. Operation is via the 
‘SPEAKER’

 

key, (providing the handset is left in 

place). Speaker volume may be adjusted via the 3 
position switch on the rear of the phone. 

 

Features and Facilities 

 
TRANSFER KEY (RECALL / FLASH) 
The Delta 820 telephone is provided with a 
‘TRANSFER’ key, required by modern public and 
private exchanges, in order to gain access to various 
features such as ‘transferring a call’.  
 
REDIAL KEY 
If you wish to redial the last number you dialled, you 
can do so by lifting the handset and pressing the 
‘REDIAL’ button. 
 
HOLD KEY 
The microphone in the handset can be turned off 
(mute) in order for you to refer to a colleague without 
your caller hearing you. 
When using the handset. Pressing the ‘HOLD’ 
button turns off the microphone and presents the 
calling party with comfort music. 
Pressing the ‘HOLD’ button turns the microphone 
back on. 
Similarly when using the handsfree option. Pressing 
the ‘HOLD’ button turns off the microphone and 
presents the calling party with comfort music. 
Pressing the ‘SPEAKER’ button turns the 
microphone back on. 

 

MEMORY KEYS 
The Delta 820 comes with 10 non volatile (no 
batteries required) memories, for efficient speed 
dialling of commonly used numbers. Making a call 
via these keys is as simple as lifting the handset and 
pressing the desired memory key.  
 
To identify these keys it will first be necessary to 
write the names of the company or individuals the 
keys will represent on to the label provided. This 
label is held in place by a clear plastic cover, which 
can be removed by simply un-clipping the retaining 
clips on the edges and lifting clear. 
 
 

With the memory card removed you are now ready 
to program the memory buttons. 
 
Lift the handset and press the ‘STORE’ key. (This is 
a translucent button found under the 1

st

 memory 

button). 
Enter the telephone number to be dialled. If your 
telephone is on a PABX extension, it may be 
necessary to enter the access digit (9) before the 
number to be entered.  
Finally press the memory key to be programmed. 
 
The message waiting button can also be 
programmed in the same way with the PABX’s 
feature code to retrieve stored voicemails. 
 
WALL MOUNTING 
The phone can be wall mounted. The handset hook 
guide will need to be adjusted. This is achieved by 
sliding it upwards, rotated it by 180 degrees and 
returning it to its slot. The base of the phone can be 
secured to a suitable surface; screws should be 
83mm apart. 

 
 
 
 
Help 

 
If the telephone appears to be faulty when first 
connected, a few simple checks may help to identify 
some possible problems, as listed below: 
 
NO DIAL TONE 

  Ensure you are using the cables that 

came with this phone. 

  Check that the telephone plug is fully 

inserted in the socket 

 

If it is, try connecting the telephone into 
another socket, if available. If dial tone is 
now heard, the original socket is faulty. 

  Alternatively, try connecting another 

telephone into your socket. If this 
telephone gives dial tone, then your new 
telephone is probably faulty. 

 
 

Further concerns may also be addressed by 
calling our Technical Support Department on 
0845 421 0730 or visiting our website, 
www.atltelecom.com/support

 

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