Going to be replacing an old Toshiba system with a new IP Office in the next few weeks. The system will be fed via 2 dedicated T1 circuits (not PRI). Currently, each circuit hits a CSU before going into the Toshiba system. Is it wise to leave these CSU's in place or can I simply go from the smartjack straight to the IPO? I am thinking that the IPO has in internal CSU builtin to the daughter card. Thoughts?