I have installed fring for my Samsung Omnia .Then I configure the fring to avail SIP on my hand device . After the sucessfull configuration , I tried a number for test call…….Then unfortunately it didn’t work, saying some “..error occured please notify this error to Microsoft..”(This is not the exact wordings but some how means the same) .

Do you have any idea why this is so ?
NOTE:I have configured fring to always stay connectetd thru GPRS not WiFi .