OK, so how to configure the whole device to have this working?Of course it is, you can use 3CX on an android phone with wifi only. To make external calls you need a SIP trunk configured on Startup, maybe this is the issue you have
And second question is on the same device with WAN+WLAN is working OK - even without any other SIP configuration. On both devices just the 3CX client with the QR activation done.OK, so how to configure the whole device to have this working?
I have just the 3CX Startup version. So should i add the 3CX values as my SIP account in the device settings?
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.