Interquartz 98583 - Manual (Page 4)

3
REN number
The REN number of this telephone is 1.
If you wish to connect any other equipment to the line, simply add the REN
numbers of each piece together and ensure that the total does not exceed 4.
If too many phones are connected to the line, the circuit may be overloaded
and your telephone may not ring.
Not all telephones have the same REN. If a British Telecom phone is supplied
unmarked, you can assume that it has a REN of 1
Handsfree speaking / On hook dialling
This telephone is designed to work on most telephone lines by drawing power
from the line. However, when using the on-hook dial facility or the loudspeaking
facility, there are some instances where the power available may not be
sufficient to provide an adequate performance.
This telephone requires the use of batteries for memory back up ( see
Figure 2 ) and, in the event of insufficient line power, the batteries also
provide an additional power source for loudspeaking operation.
Emergency calls
"999" calls can be made on this telephone, for the purpose of making calls to
the emergency service. An access code may also be required, if the phone
is connected to a PABX.
Audible tones
This telephone is provided with a "valid" and an "invalid" audible tone.
Whenever a button is pressed following a valid operation, e.g. dialling a
number from memory, a short high pitched sound will be heard. If an incorrect
operation is attempted, e.g. pressing a memory button when no memory is
present, then a low pitched sound will be heard.