Routing elements
171
System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013
Substitution Circuit
The first call is answered by the manager personally; a second simultaneous call
will ring on the deputy manager’s set; the third call will ring in the secretary; the
fourth caller will obtain "busy". The calls can be visually signalled everywhere im-
mediately. Acoustic signalling takes place after a delay.
Fig. 71
Substitution circuit with key telephones
Other Subjects Relating to Key Telephones:
Terminals, Internal traffic, Incoming traffic, Outgoing traffic, User-related
features.