I have enable "Dialer Integration" and "Use default account for every call".
I have enable in connectivity only wifi network (disable 2G, 3G and 4G).
When i am connected on network "wifi 1", my smartphone is connected on my IPBX and i can make calls.
When i disable wifi, call works on GSM network.
But when i am connected on a other wifi network and is not possible to join ipbx, i cannot make call.
It is possible to add a automatically switching to GSM network when smartphone is not registred on ipbx ?
Thanks for your help