Easy WiFi is not making any connections unprompted on the S60 devices. All that happens is we keep monitoring the scan list, and if a matching network is found (and hotspots and personal networks are treated the same way for this), then we will set the SSID for the Easy WiFi IAP to match that network. The system can then indicate that the Easy WiFi AP is available when it sees a match between the Easy WiFi AP and the scan list. We don't control any connections (we wish we could, but that's not the S60 way).
If an application is monitoring availability of connections, it should see the Easy WiFi AP become available after we set the SSID to one in the current scan list. I didn't realise the VoIP application would change connections automatically - most Symbian apps are happy to use the connection they have until it gets dropped, and then they start looking for a new one.
The only thing I can think of that might cause it to not work is a bug we found the other day where in some circumstances, a network that is running more than one access point in the same venue might not be considered for matching. In an airport, I can see that being the case. We have a fix coming soon for that one.