Here's what you want to end up with in the OBi itself for Callcentric on SP2:
Service Providers -> ITSP Profile B -> General -> Name : Callcentric
Service Providers -> ITSP Profile B -> General -> DigitMap:
(*123|<'S'B:**275*>xx.|<**275*:SB>xx.|[2-9]11S0|<1aaa>[2-9]xxxxxx|<1>[2-9]xxxxxxxxx|1xxxxxxxxxx|
011xx.|(Mipd)|[^*#]@@.'@'@@.)
where aaa is your local area code.
Service Providers -> ITSP Profile B -> SIP -> ProxyServer :
callcentric.comService Providers -> ITSP Profile B -> SIP -> OutboundProxy :
callcentric.comService Providers -> ITSP Profile B -> SIP -> RegistrationPeriod : 3600
Voice Services -> SP2 Service -> X_ServProvProfile : B
Voice Services -> SP2 Service -> AuthUserName : 1777nnnnnnn
Voice Services -> SP2 Service -> AuthPassword : (sip password)
Voice Services -> SP2 Service -> CallerIDName : (callerid name)
Voice Services -> SP2 Service -> MWIEnable : (checked)
Voice Services -> SP2 Service -> X_VMWIEnable : (checked)
Voice Services -> SP2 Service -> MessageWaiting : (unchecked) (Default unchecked)