You might try configuring the OBi directly after setting:
System Management -> Auto Provisioning -> ITSP Provisioning -> Method : Disabled
System Management -> Auto Provisioning -> OBiTALK Provisioning -> Method : Disabled
Use all Default settings on SP2 / ITSP Profile B except the following:
Service Providers -> ITSP Profile B -> General -> Name : freephonie
Service Providers -> ITSP Profile B -> SIP -> ProxyServer :
freephonie.netService Providers -> ITSP Profile B -> SIP -> RegistrationPeriod : 1800
Voice Services -> SP2 Service -> X_ServProvProfile : B
Voice Services -> SP2 Service -> AuthUserName : (sip username)
Voice Services -> SP2 Service -> AuthPassword : (sip password)
Voice Services -> SP2 Service -> CallerIDName : (callerid name)