JAVA Telephony Application Program Interface

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JAVA Telephony Application
Program Interface

• by Narayana Vadlamani

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Project Agenda

• What is JTAPI?
• JTAPI Architecture
• Software Engineering and JTAPI
• Rationale of JTAPI
• Pitfalls

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JTAPI

• Portable, object-oriented API for java-based
  computer-telephony applications.
• JTAPI is the interface between java computer
  telephony applications and telephones or
  telephone system implementations.
• Consist of the set of classes and interfaces
  which are available in the package javax..
• JTAPI supports both first- and third-party
  telephony application domains.

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Basic philosophy guiding JTAPI design includes

• Brings simplicity to the most basic telephony
  applications
• Provides a scalable framework that spans desktop
  applications to distributed call center telephony
  applications
• Interfaces applications directly to service
  providers or acts as a Java interface to existing
  telephony APIs, such as SunXTL, TSAPI, and TAPI

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• Based on a simple CORE that is augmented with
  standard extension packages
• Runs on a wide range of hardware configurations,
  wherever Java run-time can be used

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Architecture

• JTAPI uses two architectural concepts
• The JTAPI Peer
• The Core Plus Extension Architecture

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JTAPI Peer

• Implementation of JTAPI for a particular
  telephony platform
• Example PBX systems, call center servers,
  telephone sets.
• JTAPI, standard Java APIs and the JVM are
  implemented on top of the telephony platform peer
• peer represents the telephony systems operating
  system (OS) and the hardware of the platform.

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JTAPI Peer
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JTAPI Wrapper
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Distributed JTAPI
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Core Plus Extension Architecture

• defines a minimum package of core functionality
  that most JTAPI implementations will have.
• provides the functionality to make and answer
  simple two party calls.
• additional optional packages that extend the core
  interfaces can be included in a JTAPI
  implementation as required.

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JTAPI Extension package

• JTAPI extension packages are not restricted to
  extending just the functionality present in the
  core.
• Add functionalitys not present in the core.
• All JTAPI implementations require the core
  package
• The other packages are optional.

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JTAPI Core Extension Architecture
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Core/Extension Package Relationship
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The packages defined in JTAPI 1.3

• Core package - javax.telephony
• Call Control - javax.telephone.callcontrol
• Call Center - javax.telelphone.callcenter
• Media -javax.telelphone.media
• Mobile -javax.telelphone.mobile
• Phone -javax.telelphone.phone
• Private Data -javax.telelphone.privatedata

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CORE

• The core package contains
• Basic call control methods
• createCall(),
• connect(),
• answer(),
• disconnect()
• Capabilities for each of these methods.
• Simple state transitions with corresponding
  events.

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Connection State Transitions
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TerminalConnection state transitions
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Call Control

• javax.telephony.callcontrol package extends the
  core package
• providing more advanced call-control features
• detailed state model of telephone calls

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• The additional calling features include
• conference calling
• transfer
• forwarding
• call hold
• call join
• message waiting
• do not disturb
• call park pickup

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Callcontrol Connection States
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Call Center

• Provides applications the ability to perform
  advanced features necessary for managing large
  call centers.
• The advanced features include
• ACD agent support
• Routing,
• Automated Call Distribution (ACD),
• Predictive Calling
• Application Data (associated with telephony
  objects.)

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RouteSession Routing
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ACD Address Model
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Agent Terminal States
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Phone

• Permits applications to control the physical
  features of telephone hardware phone sets.
• The phone package provides interfaces to model
• buttons
• displays
• Lamps
• ringers
• hook switches
• Speakers
• microphones

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Mobile

• JTAPI Mobile extends core JTAPI with the
  following mobile network functionality
• Mobile Call Control,
• Mobile Network Access and Control
• Media Services for Mobile Applications

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Media

• Provides ability to manipulate media streams
  associated with calls.
• Resources for fax servers and automatic speech
  recognition are in the planning stages.
• Uses an extensible resource architecture to
  provide media services for
• Players
• Recorders
• Signal Detectors
• Signal Generators

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Call Model
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Call Model Core Objects

• The Call Model used in JTAPI consists of six
  primary or core call control objects
• Provider - the "window" through which JTAPI
  applications see the telephony system.
• Call - the dynamic "collection of logical and
  physical entities" that bring two or more
  endpoints together.
• Address - a logical end-point - a "phone number".

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• Connection - the dynamic relationship between a
  Call and an Address.
• Terminal - a physical end-point - a "phone set".
• TerminalConnection - the dynamic relationship
  between a Connection and a Terminal.

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Call Model timing diagram
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Private Data

• javax.telephony.privatedata package enables
  applications to communicate data directly with
  the underlying hardware switch.
• Means by which applications can send
  platform-specific messages to the underlying
  telephone platform.
• Use of this interface interferes with application
  portability across different JTAPI
  implementations

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Rationale for Java-based Telephony API

• Desire to maximize application portability across
  vendor implementations.
• JTAPI implementations may not be portable.
• JTAPI applications may be portable.
• JTAPI creates an API that allows applications to
  run on a variety of operating systems and
  hardware platforms, against a variety of
  telephony networks.

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• JTAPI isnt "just another telephony API" -
  although JTAPI can be implemented without
  existing telephony APIs, it was also designed to
  allow implementers to build on top of these
  existing telephony APIs.

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Software Engineering JTAPI

• JTAPI uses OO design
• In the long run it will be used in Component
  Based Development

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Pitfalls

• Check Capabilities
• Telephony environments vary widely in their
  functionality. JTAPI cannot reduce this
  variation, however JTAPI provides ability to
  check the capabilities of the telephony
  environment.

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THANK YOUAny Questions ?