EPABX (ELECTRONICS PRIVATE AUTOMATIC BRANCH EXCHANGE)

CONTENTS INTRODUCTION ADVANCEMENTS IN PBX CENTREX SERVICES TYPES OF EPABX VOIP PSTN & ISDN CALL BIILING SOFTWARE CALL LOGGING CALL SIGNALLING ADVANTAGES DISADVANTAGES APPLICATIONS

WHAT IS EPABX & WHY IT IS NEEDED?

A Switching systemKnowledge of traffic pattern

Efficient in offices

ADVANCEMENTS IN PBX

Auto conferencing

Automatic redialing of numbersCall transferring & call forwarding

Auto attendant

Inbuilt paging

CENTREX SERVICES EPSCS facility

Trunk level interconnection

PBX TIE TRUNK HIERARCHY

Interconnection through switches

HU

SATELLITE TIE TRUNKS

Used in campus

HDLC protocol

IMPLEMENTATION OF EPABX

Multiple line extensions

TYPES OF EPABX SYSTEMS

Analog PBX

Digital PBX

IP EPABX Network card interface Multiple simultaneous calls VOIP tech.

HYBRID EPABX

Digital PBX with IP PBX capabilities

Without network chipService provider: Toshiba, Inter-Tel & Mitel

Without network chip

HYBRID EPABX

DIGITAL EPABX

Auto attendant

CLI based routing

Call & trunk

budgeting

Least call routing

DIGITAL EPABX

ANALOG EPABXAuto fax

detection

Backup

Call billing & call

budgeting

DIDRemote paging

Restricted & denied

dialing

IP PBXSingle network

for voice & data.

Reduction in expenses

Function: work as a software

system

Control of live calls

Conferencing

Interactive voice

response.

IP PBX Features: Unlimited extensions Unlimited auto attendants

VOIPVoice

communication

Protocols used:

H.323

MGCPSIP

RTI

SDP

VOIP

PSTN & MOBILE N/W PROVIDERS

IP backhaul

Corporate use

HISTORICAL MILESTONES 1974: IEEE published a paper 1985: creation of NSFNET. 1994: invention of VOIP 1995: Standardization for VOIP 1996: Voice comm. 1993: First soft switch 1999: Open source PBX 2004: VOIP service providers proliferate.

PSTN Consists of Fiber optic cables , telephone

lines etc. Single address space Single numbering plan

ISDN Simultaneous digital transmission

Integration

CALL BILLING SOFTWARE User wise rights declaration

Party maintenance

Extension details

Security

Scanned registration forms

Shifting

Reprocess calls

AREA WISE CALL DETAIL

CALL ACCOUNTING SYSTEM

Records events

Detection of calls

Call logging

WORKING OF CALL ACCOUNTING

Collects data

Attachment of revenues

Sends information

Storage of data

Collection of voice data

CALL LOGGING

Collection of phone call data

CDR data

To generate geographical reports

CALL SIGNALLING

To set up a connection

Authentication

Minimization of risks

ADVANTAGES OF EPABX Cost reduction

Predetermination of calls

Software accomplishment

Portability

Flexibility

DISADVANTAGES OF EPABX

Needs electric power

Low installation & configuration

Increase in long distance charges

Low mobile workforce

APPLICATIONS Call center

Computer support center

IT response center

Technical support center

Information center

Resource center

FUTURE SCOPE

Include VOIP PBX

Additional features

CONCLUSION

A modern PBX from the equipment point of view , is much simpler then the older electromechanical systems . Most of its sophistication is built inside the chips that actually carry outside the work. The switching matrix tends to be quite small ,& new opportunities are available for convenient design of user terminals. Trunk circuits, going mostly to obsolete (2-wire analog) central offices and to analog long-haul tie-trunks, still have to meet the outside world on its own terms, but even they, while they are still with us, take advantage of PBX control and component sophistication. Fortunately, new standards may soon let us leave the analog world behind.