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
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.
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