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 developing proposed extensions. Services and features are provided end to end whenever possible. Extensions and new features must be general purpose, 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 specification, which enables multiparty services, such as transfer and bridged sessions. Completion of the SIP caller preferences specification, which enables intelligent call routing services. Completion of the SIP INFO method extension, used for carrying SIP session related information. Other deliverables may be agreed upon as extensions are proposed.