Re: voip network hopping

[Cameron Byrne <cb.list6 () gmail com>]

On Aug 10, 2012 12:19 PM, "shawn wilson" <ag4ve.us () gmail com> wrote:
> i'm curious if there is any spec in the voip protocol suite that
> allows one to maintain a call while changing networks?
>
> what i want to do is setup a softphone on an android phone. however,
> this won't work very well if i can't switch from wifi -> 3g -> wifi (i
> doubt wifi -> wifi is possible because of hardware limitations). my
> alternative is to get asterisk to put the call on hold and play an
> automated message if a reconnection (and unhold) takes >1 second. i
> would expect that ip telephony would allow for some type of hopping
> though, i just don't know what to google for?

In IMS this is called session call continuity (scc or vcc) and is defined
by the 3gpp

UMA and GAN do this too, but not for sip.

CB