From reading SIP packets of a successfully registration with us.voxalot.com it appears that Realm should be "voxalot.com". It seems that your Billion ATA successfully completed SIP authentication in the first instance above, and yet was prevented from registering, and you received the "SIP Registration is Forbidden" message. When you changed Realm to au.voxalot.com then registration failed and the process never progressed far enough to receive the "SIP Registration is Forbidden" message.
If you have second working Voxalot account try registering the Billion to that account. If the Billion unit works with the second Voxalot account it means the "Registration Forbidden" problem is with the first Voxalot account.
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