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Reply To: 12KHz / 16KHz

Teodor Georgiev

could be. I think – yes.
Also, the newer billing systems used on PBXes with ISDN PRI rely not on the 12/16Khz, but on the ETSI AOC (Advice of Charge) messages.
The beast (Cisco) does not pass AOC messages between its PRI interfaces.
Go figure it 🙂