voip network hopping

Fri Aug 10 23:55:02 UTC 2012

On Aug 10, 2012 12:19 PM, "shawn wilson" <ag4ve.us at 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