| 摘要 |
A communication system provides for establishing a communication environment where multiple media applications can share the same communication port/channel in a communication session. When establishing a communication session, an application or media application can create a token that can include information regarding resources assigned to or to be used with the communication session. The token may then be used and interpreted by other applications. When communicating during a communication session, the applications and/or components negotiate for access to ports or communication channels assigned to the communication session. Thus, two or more applications may use the same port(s) during the session by obtaining the token and accessing the resources assigned to the token. In this way, fewer ports or channels are used by the multiple applications by sharing resources and this provides simplified server control of the session requiring maintenance of fewer ports. Sessions may be set up using SIP INVITE messages with establishment of a control channel to a media server based on the INVITE message. The SIP INVITE message may comprise a Session Description Protocol (SDP) offer message. The token may be an XML encoded schema incorporated into the header or body of a SIP message, such as a Dialog State Event (DSE) message. The method (Figure 4) is also described in terms of a first feature sequencer, user relation element 106a, first communication endpoint 102a, first application 110a and media server 112, for example.
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