The Sip Broker DigitMap (<*>[x*][x*].|*[x*][x*].) expects or forces a leading '*'. That's because Sip Broker always expects the first thing it receives to be *sipcode. I don't think that's going to work well with Callcentric unless everything you intend to dial there wants a leading '*'.
If you simply want to be able to send arbitrary dialing to Callcentric with no checking or enforcement, I would suggest:
([x*][x*].)
This says to accept one or more digits/asterisks and send it unmodified.