Hi,
If possible put additional NIU in the system to gather billing records... One NIU can support both serial & Ip connection for billing.. You can have even similar priority on both outputs...
Look for CIL on V.24 & CIL on ethernet for the sequence of commands..
Cheers,
""The truth about action must be known and the truth of inaction also must be known; even so the truth about prohibited action must be known. For mysterious are the ways of action""