Main functions:

Conference Call

Auto-tuning ISDN (communications central office to branch offices)

Using a PBX system several different offices

CTI - the ability to integrate PBXs with a computer

Remote automatic diagnostics

Voicemail

Outgoing calls cheaper route automatic selection

Caller ID

D-XDP - one port several independent telephones connecting

UCD - group of subscribers automatic call distribution

Autodial

PIN-code phone locking

Support modes (day, night, etc.)

Appointment of various classes of service for domestic issues

Hands-free alerts

Pay calls limiting

Intercom / lock

The call interception, transfer or parking

Call duration limit

DISA - external caller can access internal pbx features on certain lines by keying in a special code

Setting talks duration limit

Background music

Fast dial

Automatic incoming calls distribution