Internet and Telephony

1
Internet and Telephony

• Kwan Hong Lee
• May 6, 1998

2
Outline

• Motivation
• System setup and architecture
• Programming Environment
• Applications
• Problems
• Conclusion

3
Motivation

• Now Internet and Telephony separate
• Goal explore services and applications that
  integrate Internet and Telephony
• Basis JTAPI
• rapid web application development
• applications run anywhere

4
Outline

• Motivation
• System setup and architecture
• Programming Environment
• Applications
• Problems
• Conclusion

5
System Configuration
6
PBX

• Lucent Generic 3 Switch
• Provides telephony services
• call management, billing, call conferencing etc.
• Very complicated
• Several analog phones connected

7
Telephony Server

• Telephony Services Module
• Links applications and switch driver
• Routes messages and events
• Switch driver
• Terminates CTI link and protocol
• Map CTI protocol to TSAPI

8
Telephony Services

• Telephony server IP address and port number (450)
  stored in TSLIB.INI where telephony application
  resides

9
Using the Service

• PBX driver registers services (TLINKS) with the
  telephony server (Tserver)
• Select TLINK
• VENDORDRIVERSERVICESERVERNAME
• User logs in with Windows NT login and password
• Ready to use telephony services

10
Architecture
JTAPI
TSAPI
CSTA
G3PD
ASAI
PBX switch
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ASAI

• Definity specific
• Allows applications to access switch features and
  control calls
• Ethernet interface

12
TSAPI

• API that allows applications to control the PBX
  services
• call control
• call/device monitoring
• query

13
Java Telephony API

• Easy telephony application development
• Object oriented, reusable, cross platform
• Integrates telephony services with web
  applications
• Telephony services controlled through the
  Internet
• Applets

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Outline

• Motivation
• System setup and architecture
• Programming Environment
• Applications
• Problems
• Conclusion

15
JTAPI Core Extensions

• java.telephony
• java.telephony.callcontrol
• java.telephony.callcenter
• java.telephony.media
• java.telephony.privatedata

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JTAPI Call Model
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Call States

• Connection states
• (logical view)
• Terminal connection states
• (physical view)

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JTAPI Example

• mycall m_provider.createCall()
• c mycall.connect(m_origterm, m_origaddr,
  phoneNum )
• CallControlConnection.redirect( m_dest )
• Connection.disconnect()

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DTMF Detection

• Requires VDN and call vectors
• Call vectors store routing forwarding information

VDN
VDN
Terminal
forwarded
forwarded
Call Observer
Call Observer
Inside Call Observer
lucentUEC ( (LucentCallInfo) evlisti
).getUserEnteredCode() if ( lucentUEC ! null
) RecvCCObserver.collDigits lucentUEC.getDigits
()
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Outline

• Motivation
• System setup and architecture
• Programming Environment
• Applications
• Problems
• Conclusion

21
Applications

• Internet voice message server
• Alarm call service
• Enhanced Help Desk
• Schedule based call forwarding
• When you dial a number, the web page pops up
• weather phone call --gt pops up weather web page
• Applications in text to voice and vice versa
• Use of caller ID, call queueing

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Alarm Call Service
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Alarm Call Service
Client
Server
Request Queue
Send Request
ACK
Make Call
Client managers handle multiple requests by multi
threading and inserts the requests at the
appropriate place among the requests in the queue
Sample Request
Timer variable keeps track of the time when the
next request needs to be processed and puts the
thread to sleep until then.
Guestguest455151894357900000
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Switching Plane of VMS
45520
45530
Extension entered (3 digit)
Extension PIN entered (7 digit)
The digits entered by user are collected during
ALERTING state.
45521
Automatic routing

• Calling address and called address collected
• Send calling address and extension ( PIN)
• If ACK is received, redirect to Voice Message
  Server, if NOACK, disconnect

45511
45513
When connection becomes disconnected, send
FINISHsignal and close all socket connection
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Phone E-mail
Telephony Server
Sends e-mail 45510_at_vada.cs.cornell.edu
SMTP Server
TTS
When no physical phone is accessible.
Converts e-mail content to voice and saves as
real audio format.
Could be forwarded to pager with text content
User could check the voice mail through phone,
e-mail or web.
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Scheduled Call Forwarding
Telephony Server
SMTP Server
Send call forwarding schedule
Callforward_at_vada.cs.cornell.edu
E-mail message contains password time and phone
numbers
Lookup database for authentication by checking
the sender and the password Parse the
request Either store it in database or in
memory data structure
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Outline

• Motivation
• System Setup and Architecture
• Programming Environment
• Applications
• Problems
• Conclusion

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Initial Difficulties

• Documentation
• difficult for first time user
• 5 second to get the phone off hook when call made
• Parameter setting in ASAI setup
• logon as a service
• Phone wire connection
• User interface in setup forms

29
Suggestions

• GUI for setting up stations and other options
• A multimedia tutorial on PBX switch
• installation and setup
• Requires double administration
• Switch setup and telephony services admin on
  controller desktop

30
Conclusion

• Great potential in applications that make use of
  telephony services through the Internet
• Integration with web and multimedia technologies
• Java servlets, Java media framework, Personal Java