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 • VENDOR#DRIVER#SERVICE#SERVERNAME • User logs in with Windows NT login and password • Ready to use telephony services

10. Architecture JTAPI TSAPI CSTA G3PD ASAI PBX switch

11. 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

14. 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

16. JTAPI Call Model

17. Call States • Connection states (logical view) • Terminal connection states (physical view)

18. JTAPI Example • mycall = m_provider.createCall(); • c = mycall.connect(m_origterm, m_origaddr, phoneNum ); • CallControlConnection.redirect( m_dest ); • Connection.disconnect();

19. DTMF Detection • Requires VDN and call vectors • Call vectors store routing forwarding information VDN forwarded VDN forwarded Terminal Call Observer Call Observer Inside Call Observer lucentUEC = ( (LucentCallInfo) evlist[i] ).getUserEnteredCode(); if ( lucentUEC != null ) RecvCCObserver.collDigits = lucentUEC.getDigits();

20. 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 --> pops up weather web page • Applications in text to voice and vice versa • Use of caller ID, call queueing

22. Alarm Call Service

23. 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. Guest#guest#45515#1#894357900000

24. 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

25. Phone E-mail Telephony Server Sends e-mail 45510@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.

26. Scheduled Call Forwarding Telephony Server SMTP Server Send call forwarding schedule Callforward@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

27. Outline • Motivation • System Setup and Architecture • Programming Environment • Applications • Problems • Conclusion

28. 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