Re-writing caller ID

SIP Express router or Kamailio would be good choices. Asterisk is could also do it, but since its more of a PBX model, it has a lot more unneeded overhead for this kind of function.

Hi, I have a Cisco AS5300 facing the TDM which serves as a number translator (rewriting the caller ID into something). The problem is — Cisco has a finite limit on the number of translations that can be done on the AS5300 (approx. 128-300). I was thinking of moving the number translation function into a separate box. What systems do you recommend for this function? Can SIP Express Router or Asterisk do this?