Call Detail Recording (CDR)
On successful call attempts that use ISDN Call-By-Call trunk groups, CDR records the Network-Specific Facility (NSF) that is specified by the NSF IE of the call. CDR refers to this information as the ISDN Network Service (INS). The value that is passed to CDR is the 3-digit equivalent of the NSF IE. NSF information for Facility Type 2 calls, which is used with ISDN Call-by-Call trunk groups, is also recorded if the NSF is available in the incoming SETUP message.
If an outgoing Call-by-Call Service Selection call uses an interexchange carrier (IXC) other than the presubscribed common carrier, CDR records the 3-digit or the 4-digit IXC code . CDR might not record the IXC code properly if the dialed-code format differs from the IXC formats that are used in the US.
When a Call-by-Call Service Selection call is rejected because of a Usage Allocation Plan (UAP), CDR records the cause as an ineffective call attempt. The NSF recording also occurs for the user-defined Facility Type 2 call. However, the NSF recording occurs only if the NSF is available in the incoming SETUP message.
