The need to ease Service and Personal Mobility between User Agents (e. g. session transfer from a Web browser on a desktop PC to a mobile device; or a Web browser to a Telephone in case of a Multi-channel Application).

The need to ease Service and Personal Mobility between User Agents (e. g. session transfer from a Web browser on a desktop PC to a mobile device; or a Web browser to a Telephone in case of a Multi-channel Application).
The need for adaptive user agents in converged applications (HTTP and SIP) where same user agent (e. g. a Web browser) can be used to perform SIP activities like voice call and video conferencing in addition to its existing capabilities.

The need for adaptive user agents in converged applications (HTTP and SIP) where same user agent (e. g. a Web browser) can be used to perform SIP activities like voice call and video conferencing in addition to its existing capabilities.