SIP Mobility

SIP Mobility

  • Terminal mobility† ⇒ the terminal moves between subnets
    • Note: Mobile IP supports this at the network layer, while SIP supports this at the application layer (without requiring Mobile IP be underneath)
  • Personal Mobility ⇒ the person moves between terminals
  • Service mobility ⇒ the person has access to the same services

despite their movement between terminals and/or networks

    • note: the service may be reduced in quality or capabilities subject to the current network’s capabilities -- but it is the same service
    • this implies that personalization of services must be distributed to the various terminals that the user wishes to use - see the dissertation of Roch Glitho [Glitho 2002]
  • Session mobility ⇒ the same session is maintained despite the user changing from one device to another

† Also known as network-level mobility.

Slide Notes

Roch H. Glitho, “A Mobile Agent Based Service Architecture for Internet Telephony”, Doctoral Dissertation, Royal Institute of Technology (KTH), Microelectronics and Information Technology, TRITA-IT-AVH:02:01, April 2002. http://kth.diva-portal.org/smash/get/diva2:9108/FULLTEXT01 Links to an external site.

See also: SIP Mobility informal meeting: Unedited Version of SIP-Mobile Minutes, 50th IETF, 730-830pm, March 20th 2001 at Salon A, Minneapolis, Minnesota, http://www.research.telcordia.com/SIP-mobile/sip-mobile-minutes-50.htm Links to an external site.

Transcript

[slide239] A little bit about SIP mobility. The first thing is terminal mobility. I can take my terminal and I can move from being connected to this network to that network when I change IP addresses, I update my registrar, calls can now be directed to me. But there's also personal mobility. I can switch from using that terminal to using this terminal. And there is service mobility. I go from using one set system with a set of services to now using another system, can I move my services with me? So today the first two are well supported. Service mobility, however, isn't really supported. Because the new service that I switched to might not offer those services at all. An of course, I can have session mobility, so I can be in one session and I can switch from the session from my laptop to using a session via some other system, like the projector.