Your Voice Mailbox password is set-up on the Voice mail page when you log into your account online. The default is 9999.
Can you explain what you mean by an internet call?
Are you using a Softphone on a computer, or a hardware phone or ATA (Analog Telephone Adaptor) ?
Are you trying to call another Voxalot account number or another VoIP number or a traditional land-line number?
Do you have any Providers set-up under your Voice Service Providers page?
Do you have a Smart Call / Dial Plan set-up?
See also the Voxalot Tutorials at :
Main Page - Voxalot FAQ