[stifiling]

not sure what's goin on wit your wifi..but voip should work over the phones evdo connection as well.

Install custel's first, then install setupvoip.
restart
in programs go to setup voip
enter your sip settings
under options select from the drop down only if cell is not available (this is just for incoming...u'd change it to make outgoing. we're testing and troubleshooting right now anyway so wanna make sure incoming's working first)
check enable voip over 3g....hit Done,
soft reset.
after the phone boots back up double check setup voip to make sure your settings are still there...
if not reenter and make sure you hit done and save and soft reset again.
start internet explorer to make sure u're connected to evdo or wifi.
then try calling the apache via voip.