SIP (Session Initiation Protocol)

SIP (Session Initiation Protocol) is a protocol specified by the IETF (RFC 3261) that defines a method for establishing multimedia sessions over the Internet. Used as the call signaling protocol in VoIP, NENA i2 and NENA i3.

NENA-STA-010, NENA i3 Standard for Next Generation 9-1-1


 * RFC 3261, SIP: Session Initiation Protocol
 * Microsoft Glossary