ZyXEL Communications NXC5200 User Manual page 231

Hide thumbs Also See for NXC5200:

Table of Contents

Chapter 15 ALG

H.323 is a standard teleconferencing protocol suite that provides audio, data and

video conferencing. It allows for real-time point-to-point and multipoint

communication between client computers over a packet-based network that does

not provide a guaranteed quality of service. NetMeeting uses H.323.

The Session Initiation Protocol (SIP) is an application-layer control (signaling)

protocol that handles the setting up, altering and tearing down of voice and

multimedia sessions over the Internet. SIP is used in VoIP (Voice over IP), the

sending of voice signals over the Internet Protocol.

SIP signaling is separate from the media for which it handles sessions. The media

that is exchanged during the session can use a different path from that of the

signaling. SIP handles telephone calls and can interface with traditional circuit-

switched telephone networks.

When you make a VoIP call using H.323 or SIP, the RTP (Real time Transport

Protocol) is used to handle voice data transfer. See RFC 1889 for details on RTP.

NXC5200 User's Guide

Troubleshooting

Nxc5200 - v2.20