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