Motivation

The lack of standard authentication and hand-off/transfer mechanisms in the present HTTP Session mobility approaches.
SIP with its Session Mobility (RFC 2543) has well-defined ways of achieving session mobility and extensible for various applications.
Proposed integration of HTTP Proxy, RSTP Proxy and Application Policy Function in the IMS Core Network in order to harmonize SIP, HTTP and RTSP service delivery.
Emergence of adaptive user agents in converged applications where same user agent can perform voice, video and data communication.

The lack of standard authentication and hand-off/transfer mechanisms in the present HTTP Session mobility approaches.