Operation Manual

page 6
3. Testing ISDN Access Lines
Placing Calls (ISDN S/T or U)
To place a phone call now, simply press the handset key
and follow the menu as outlined. Different telephone
numbers and types of services can be selected.
Confirming these a connection will be established.
During a call the B channel used (B01), type of service
(Telephony ISDN), and destination number are shown.
Furthermore when coupling different PBXs or operators,
different TON (type of number) and NP (numbering plan)
can be used. AOC (advise of charge) indicates the costs
of the connection, CR value (call reference) identifying
the call and length/flag of the CR is displayed.
Alternatively, a specific
B channel can be selected
byentering either 1 or 2
U interface
different ISDN services
S/T interface