When on a call via wifi, if signal drops and the device switches to mobile data, audio is lost. This is commonly referred to as "handoff", which CSipSimple and Linphone support, probably by sending a new INVITE when a network change is detected.
Does ZoiPer have this capability? It would be nice not to lose audio if I go out of range of the wifi access point where a call started. Signaling still appears to work, because I can end the call and it immediately hangs up on the other end... but audio does not reconnect. If I get back onto the same wifi network without hanging up, audio works again.
I'm using UDP - I have no choice, TCP not supported by the PBX I have to use. I have tried with STUN enabled and disabled, as well as with RPORT for media on and off. No setting seems to trigger a re-INVITE when the network changes.