SIP based floor control method in "Push to" over cellular services

摘要: Push-to-watch (PTW) over cellular (2,5G, 3G technology) is a PoC-like service extended to the transmission of multimedia streams including video. A PTW server part IMS platform used provide IP mobile users networks. The RTCP protocol usually implemented by PoC/PTW server/client entity correctly stream RTP packets in may-to-many sessions opened canonical SIP INVITE method. Floor control typical procedure charged for regulating exclusive access common resource. demanding term resources, so that case duplication media flows unneeded, as one-to-one sessions, not optimum. described floor method both and client soft-phone, derogates from favour MESSAGE IETF RFC 3428 appositely Instant Messaging. To this aim, header field "Subject" or any other proprietary request includes either attributes: Idle, Request, Grant, Taken, Deny, Release just extending control. Corresponding requests are provided carry out following procedures: "Floor Request at Session Initialization", Requested with Idle", already granted", (fig.5).