I'm using the Nokia E66 VoIP client, firmware version 300.21.012. For testing I have created two gizmo5 accounts, one configured on the phone, the other on my laptop. The currious thing is this:
Setting the phone to connect via 3G, I have no problem calling from laptop to phone and from phone to laptop. Things work.
Setting the phone to connect via the same WLAN as the laptop, I can call from the phone to the laptop, but I cannot call from my laptop to the phone.
I assume this is likely some problem due to NAT, but I can't figure out in which end the problem is. My network is like this:
How can I identify the problem? I can ofcourse sniff on the firewall, but I don't speak SIP.
Nokia )) -+
+--- Access Point -- Firewall (NAT) -- DSL router (NAT) --- (Internet)
Laptop )) -+