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Cisco Unified MeetingPlace Release 6.1 -- About the Optional Modifying Parameter
The modifying parameter, if used, is a value from 0 to 255. For example, Bell Canada uses the modifying parameter as a Service IDentifier (SID). For their Outwats service, the NSF code is not complete unless it has a BFCV of 3 and an SID of 2. Another example is Vari-A-Bill by AT&T which has a BFCV of 9 and an SID of 6.