SIP is a text-based protocol, similar to HTTP and SMTP, for initiating interactive communication sessions between users. Such sessions include voice, video, chat, interactive games, and virtual reality. The main work of the group involves bringing SIP from proposed to draft standard, in addition to specifying and developing proposed extensions that arise out of strong requirements. The SIP working group will concentrate on the specification of SIP and its extensions, and will not explore the use of SIP for specific environments or applications. Extensions and new features must be generally applicable, and not applicable only to a specific set of session types.
Simplicity is key.
Reuse of existing IP protocols and architectures, and integrating with other IP applications, is crucial. Completion of the SIP call control specifications, which enables multiparty services, such as transfer and bridged sessions. Completion of the SIP caller preferences extensions, which enables intelligent call routing services. Define a MIB for SIP nodes. Completion of the SIP extensions needed to assure satisfaction of external preconditions such as QoS establishment.