Siemens Hicom 118 User Manual page 6

The telephones are easily recognised by three dialogue keys namely:
Yes Key
Forward Scroll Key
Backward Scroll Key
The Siemens optiset E Digital Feature telephones operate via a Menu-
controlled User Guidance Display System.
The display will automatically offer you a choice of the available options most
suited to the task you are about to carry out.
Glossary
LED - Light Emitting Diode
Shuttle - Alternating between calls
DDS - Direct Destination Select (External number)
DSS - Direct Station Select (Extension number with busy and ringing
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Introduction - Cont'd
indication)