I'm having a problem setting up my Siemens Gigaset A580 IP phone with XNet VFX. The wierd thing is that incoming calls are working and I can make outgoing calls from my Android phone using the same account on the same network. The phone reports itself as registered and my account shows the registration in the MyVFX control panel, however when I try to make a call I get the message 'Not Available' on the handset accompanied by a 3-note tone.
I've also opened the following ports on my router (a WRT54GL running OpenWRT Backfire);
10000-10100 UDP (not sure if these are necessary)
Has anyone experienced the same problem? It must be some configuration for the phone that I'm missing given that other things are working.
Thanks in advance,