HITLESS APPLICATION UPGRADE FOR SIP SERVER ARCHITECTURE

摘要

The SIP server can be comprised of an engine tier, and a state tier distributed on a cluster network environment. The engine tier can send, receive and process various messages. The state tier can maintain in-memory state data associated with various SIP sessions. Various applications can be running on the engine tier, A.new version of an application can. be deployed along side the old versions, simultaneously tutoring on the SIP server (Fig 4C, #440). Incoming messages for new calls can be directed by, the SIP server to the ne version of the application. Incoming messages for previously established calls can be directed to the old version of the application (Fig 4C, #440). Once the old version is finished processing calls, it can be undeployed (Fig 4C, #448).