Session Initiation Protocol (SIP)

SIP, the Session Initiation Protocol, is a signaling protocol for Internet conferencing, telephony, presence, events notification and instant messaging. SIP was developed within the IETF MMUSIC (Multiparty Multimedia Session Control) working group, with work proceeding since September 1999 in the IETF SIP working group.

A number of standardization organizations and groups are using or considering SIP:

IETF PINT working group
3GPP for third-generation wireless networks
International Packet Communications Consortium (successor of Softswitch Consortium)
IMTC and ETSI Tiphon are working on SIP-H.323 interworking
PacketCable DCS (distributed call signaling) specification

[News] [Overview] [Where is SIP being discussed?] [What SIP extensions are being planned?] [Drafts] [SIP grammar] [Implementations] [SIP service providers] [Vendors] [Mailing list] [Public SIP Servers] [Papers] [Talks] [Related Drafts and Documents] [Draft History] [Collection of early VoIP equipment and services] [Port Assignments and DNS] [Compact headers] [SIP-related events] [SIP interoperability testing events] [Press Coverage] [Emergency Calling] [Non-Internet-related SIP sightings] [Status and Schedule] [Internships and Jobs] [Basic telephony features] [Other SIP sites]

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Last updated by Henning Schulzrinne