+10
All our clients suffer from this issue.
Following the latest update from 3CX in update 6 15.5, the softphone has finally become very good.
This last issue with moving betweend 4G and WIFI is especially painful and forces some clients to keep DECT Phones when they could just leverage iOS and Android phones and there coverage in WiFi and 4G when out of Wifi.
This is the last big issue that needs to be resolved for this app to be highly used and a big added value to use 3CX over competing PBX that now feel ancient in comparaison.
If 3CX needs to implement a propriatary protocol between the server and the softphone, then please do it. No one cares that you use sip for the 3cx softphone!