Implementing Call Park and Retrieve using the Session Initiation Protocol (SIP)

摘要: Call Park and Retrieve are useful telephony services that are familiar to many users. Existing implementations using the Session Initiation Protocol (SIP) show a variety of approaches can be taken, with varying degrees interoperability. This draft discusses a number feature variations, how they may be implemented using existing techniques. An additional URI parameter is also described, which enables further common use-cases implemented.