Last month I did some testing to 2talk's SIP service from one of our PBX systems.  We are on TelstraClear billing here  so I would have assumed that these calls would have been billed  as normal mobile calls but to my surprise I got a $45 bill for these calls using some old Callpluss acount we had years ago which  has not been used for about 5 years. Does TelstraClear use Callplus as a interconnect for some traffic ??