IP Communications Enabled by SIP.
Architectural Principles of the Internet.
Internet Multimedia and Conferencing.
SIP Service Creation.
Security, NAT, and Firewalls.
Voice Mail and Unified Messaging.
Presence and Instant Communications.
Mixed PSTN and Internet Telephony Services.
DNS and ENUM.
AAA and QoS for SIP.
The Component Server Architecture.
Conclusions and Future Directions.