I've changed the iLBC filter and double and triple checked my settings, but so far am unable to call out.

As far as I can tell everything is set up correctly; the voipwise client on my computer even signs out when I change my presence to on. Also, I've verified with the client on my computer that I can call the number I'm experimenting with (my cell) freely with Voipwise.

Settings:
my.username @ sip.voipwise.com
Transport: UDP
Outgoing proxy: sip.voipwise.com
Discover pub. address: checked
Keep-alive: auto
Keep-alive frequency: 0
Authentication tab blank
Autodetect STUN: unchecked
STUN server: stun.voipwise.com
STUN port: 3478.

Any thoughts? If there's something obiously and stupidly wrong, I'm not seeing it.