【文件属性】：
文件名称：SIP: Session Initiation Protocol
文件大小：1.21MB
文件格式：PDF
更新时间：2013-09-08 04:18:29
Sip协议 英文原版
There are many applications of the Internet that require the creation and management of a session, where
a session is considered an exchange of data between an association of participants. The implementation
of these services is complicated by the practices of participants; users may move between endpoints, they
may be addressable by multiple names, and they may communicate in several different media - sometimes
simultaneously. Numerous protocols have been authored that carry various forms of real-time multimedia
session data such as voice, video, or text messages. SIP works in concert with these protocols by enabling
Internet endpoints (called “user agents”) to discover one another and to agree on a characterization of a
session they would like to share. For locating prospective session participants, and for other functions, SIP
enables creation of an infrastructure of network hosts (called “proxy servers”) to which user agents can send
registrations, invitations to sessions and other requests. SIP is an agile, general-purpose tool for creating,
modifying and terminating sessions that works independently of underlying transport protocols and without
dependency on the type of session that is being established.