| 摘要 |
A method and SIP-based Call Session Server for routing SIP messages. A Network and Transport layer receives an incoming SIP message and forwards it to one of a plurality of SIP message routing process instances in a SIP Message Routing Framework. The receiving SIP message routing process instance determines a Routing-Key based upon at least one header field in the incoming message, and based upon the Routing-Key, forwards the incoming message to a selected one of a plurality of Back-to-Back User Agent (B2BUA) instances in a Call Session Control Framework. The selected B2BUA instance creates an outgoing SIP message utilizing the Routing-Key to generate a From-Tag in an outgoing request message, or to generate a To-Tag in an outgoing response message, and then forwards the outgoing message to the Network and Transport layer, which transmits the outgoing message. |
