Internet Telephony: architecture and protocols – an IETF perspective
Henning Schulzrinnea,* and Jonathan Rosenbergb,, aDepartment of Computer Science, Columbia University, New York, NY 10027, USA; bBell Laboratories, Lucent Technologies, Holmdel, NJ 07974-0616 USA. E-mail address: hgs@cs.columbia.edu, jdrosen@bell-labs.com
Abstract
Internet telephony offers the opportunity to design a global multimedia communications system that may eventually replace the existing telephony infrastructure. We describe the upper-layer protocol components that are specific to Internet telephony services: the Real-Time Transport Protocol (RTP) to carry voice and video data, and the Session Initiation Protocol (SIP) for signaling. We also mention some complementary ...
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