10.25.2.1. Call Forwarding (CFU, CFB, CFNR, and CD) 
Two different methods for call forwarding will be implemented for
stations using DSS1:
- forwarding using the existing HiPatn 4000 concept (FWD, FWDBSY and FNAN) if FWD is programmed via keypad. The forwarding (FWD or BUL) is then carried out on the A side, which corresponds to the procedure known from HiPatn 4000 system terminals and terminals using 1TR6/D channel signaling protocols.
- forwarding according to DSS1 protocol (CFU, CFB, CFNR and CD) if FWD is programmed functionally. Forwarding is then carried out on the B side.
The old and new forwarding methods are mutually exclusive. If forwarding
is programmed using one of the two methods and a forwarding destination
has been programmed using the other forwarding method, the latter forwardings
are all deleted.
If a forwarding destination is programmed according to both the HiPatn
4000 concept and the DSS1 concept, then, due to data inconsistencies,
the HiPatn 4000 concept dominates.