These references link directly to important technology standards, tutorials and articles related to enabling high quality, money making, real-time voice, video and multimedia communications.

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Standards

SIP		RFC 3261 Session Initiation Protocol (SIP) RFC 3262 Reliability of Provisional Responses in SIP RFC 3263 Locating SIP Servers RFC 3264 Offer/Answer Model in SIP RFC 2327 Session Description Protocol (SDP) RFC 2045 Multipurpose Internet Mail Extensions (MIME) RFC 2112 Multipart MIME
TRIP		RFC 3219 Telephony Routing over IP (TRIP)
Telephone Number Mapping (ENUM)		Working group overview and document links RFC 2916 E.164 number and DNS (ENUM) ENUM for SIP applications
MGCP		RFC 2705 Media Gateway Control Protocol (MGCP) International Softswitch Consortium
H.323		ITU-T H.323 Packet-based Multimedia Communications Systems H.245 Control Protocol for Multimedia Communication H.225.0/Q.931 RAS, Call Signaling and setup
IETF		RFC 2246 Transport Layer Security (TLS) RFC 793 Transmission Control Protocol (TCP) RFC 768 User Datagram Protocol (UDP)
Middlebox Communications (MIDCOM)		Working group overview and document links MIDCOM architecture and framework
ITU		Series G Recommendations: G.700 to G.799 Codec Standards
DiffServ		Differentiated Services (diffserv) - working group overview and document links RFC 2474 Definition of the Differentiated Services field RFC 2475 An architecture for differentiated services
MPLS		Multiprotocol Label Switching (MPLS) - working group overview and document links
IEEE 802.1q		Virtual Bridged LANs (VLAN)
PacketCable		PacketCable 1.2 Architecture Framework Call Management Server Signaling Specification
3G Wireless		Third Generation Partnership Project Third Generation Partnership Project 2 The UMTS forum

Information, tutorials and articles

The SIP Center
Henning Schulzrinne's SIP site
The SIP forum
Computer Telephony article

H.323 Papers and Overviews
H.323 Overview (registration to IEC required - free)