This Supplementary Service is called Network Call Transfer for MCI and Two B-Channel Transfer by Bellcore (NI2). This service is invoked whenever a trombone connection on the same trunk to the public network exists (e.g. Transfer, Conference, ACD- off-sire routing,...). The COT NCT and the FEASU NCT must be set to enable this SS. The user has not indication of when the NCT takes place. CDR and Trafic Metering record successfull NCTs.