1. User equipment connected to a PABX
standard telephone handsets advanced telephone handsets
paging equipment music on hold equipment
PABX facilities barring
less cost routing alternative routing
overflow call forward
speed dialing callback
group pickup hunt group
outgoing trunk queuing PABX networking
metering

2. User equipment connected to a PABX

3. User equipment connected to a PABX

4. User equipment connected to a PABX

5. User equipment connected to a PABX

6. User equipment connected to a PABX

7. Small Business Systems (key systems)
Don’t have the same number of facilities as a PABX.
Most obvious difference: all exchange lines and extensions appear on each
handset.
To get outside like user selects a free line and dials number.
Buttons are usually illuminated.
Single button use.
Heart of a SBS need powerpoint and access to the cable distributor.
Similar to a PABX, but on a smaller scale.

8. Small Business Systems (key systems)

9. Automatic call distributor (ACD)
Software option.
People who are calling wait in a cue until an operator is
available to take their call.