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W O R K S H O P

Hold the IP Phone

July 22, 2002
By Darrin Woods

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Glossary

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	In this article
	Introduction
	OS Concerns
	Glossary
	The Business Case for IP Telephony

• H.323: This granddaddy of convergence standards was approved by the ITU back in 1996 and is still going strong. See www.packetizer.com/iptel/h323/.

• H.248: Aka MGCP (Media Gateway Control Protocol) and Megaco, this IETF and ITU standard goes beyond H.323 by specifying control of multiple gateways. See www.ietf.org/internet-drafts/draft-ietf-megaco-h248v2-01.txt.

• SIP: RFC 2543 Session Initiation Protocol is an IETF standard that enables communication of multimedia elements, such as voice, chat and video. See www.ietf.org/rfc/rfc2543.txt?number=2543.

• 802.1p: An IEEE standard. Provides QoS on Layer 2 by assigning user priority values.

• 802.1q: An IEEE standard governing VLANs. See www.ieee802.org/1/pages/802.1Q.html.

For more details, see InternetWeek's VoIP glossary and InformationWeek's "Settling On Standards."