1 TAC2000/2000.7 802.16 IP Telephony Lab IP Telephony (Voice over IP) Associate Professor Quincy Wu Graduate Institute of Communication.

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Presentation transcript:

1 TAC2000/ IP Telephony Lab IP Telephony (Voice over IP) Associate Professor Quincy Wu Graduate Institute of Communication Engineering National Chi Nan University

2 TAC2000/ IP Telephony Lab NTP VoIP Platform

3 TAC2000/ IP Telephony Lab What Is the Next Step?  What will happen after VoIP is free?  What do we need after free VoIP services become popular?  Better voice quality What metrics are important to voice services? What metrics are important to voice services? How does the customers make sure they get the service quality they pay for? How does the customers make sure they get the service quality they pay for?  More flexible services Call waiting, call transfer, call blast, … Call waiting, call transfer, call blast, … Voic , conferencing, … Voic , conferencing, … Instant message & presence Instant message & presence  Is there an easy way to create new VoIP services?  Stronger security requirement DoS attack DoS attack  It is easier to protect your servers. How do you protect your WiFi phone? SPIT - SPAM over IP Telephony SPIT - SPAM over IP Telephony  SPIM – SPAM over Instant Message

4 TAC2000/ IP Telephony Lab Research Topics Discussion is required for individual student  Quality SIP Mobility SIP Mobility  NAT Traversal (UDP and TCP)  TLS (Transport Layer Security, RFC 2246)  SCTP (Stream Control Transmission Protocol, RFC 2960)  DCCP (Datagram Congestion Control Protocol, RFC 4340) Performance Measurement Performance Measurement  OWAMP (One-way ping, RFC 3763)  PESQ (Perceptual Evaluation of Speech Quality, ITU-T P.862)  Security Real-Time Wiretapping Tools for VoIP Real-Time Wiretapping Tools for VoIP Automatic Detection of VoIP DoS Attacks Automatic Detection of VoIP DoS Attacks Steganography in Speex & iLBC codec Steganography in Speex & iLBC codec Performance Comparision with Secure RTP Performance Comparision with Secure RTP Performance Study of VoIP over Fast IPSec Performance Study of VoIP over Fast IPSec

5 TAC2000/ IP Telephony Lab Real-Time RTP Auditing  Libpcap  oRTP library  Windows Audio I/O Spy

6 TAC2000/ IP Telephony Lab Real-Time Audio Encryption  Real-time encryption algorithms  Analysis of various codecs  Schemes for key exchange  Secure RTP (RFC 3711)  Comparison with IPSec Encrypted RTP Media Stream Auditing ???

7 TAC2000/ IP Telephony Lab Training Focus  Three skills Implementation (Linux/FreeBSD, C/C++ programming) Implementation (Linux/FreeBSD, C/C++ programming) Solving difficult problems (using available tools & creating new tools) Solving difficult problems (using available tools & creating new tools) Presentation (speaking, writing) Presentation (speaking, writing)  Five disciplines Always acknowledge important messages. Always acknowledge important messages. Backup your files. Backup your files. Constant progress is required; write weekly reports. Constant progress is required; write weekly reports. Documentation is required as you will see we have lots of SOP (standard operating procedure); do not overload yourself with trivial jobs. Documentation is required as you will see we have lots of SOP (standard operating procedure); do not overload yourself with trivial jobs. English is the working language. English is the working language.

8 TAC2000/ IP Telephony Lab Graduation Requirements  Prototype Finish your implementation before the summer vacation in the 1st grade Finish your implementation before the summer vacation in the 1st grade  Presentation Read an English technical article every week Read an English technical article every week  Paper Publish a (domestic/international) conference paper before the winter vacation Publish a (domestic/international) conference paper before the winter vacation  Oral defense will be arranged in May or November.