FRITZ!Box 6590 Cable Service - Knowledge Base
Number of ISDN devices and supported service indicators
You can connect up to eight devices at the same time, for example a telephone and/or PBX, to the "FON S0" port on the FRITZ!Box by means of an ISDN distributor or S0 bus cabling. The FRITZ!Box can provide power to one ISDN device. The other ISDN devices must use their own power supply.
You can use the following ISDN service indicators with devices connected to the "FON S0" port:
- Voice (service indicator 1)
- Audio 3.1 (service indicator 4)
- Telephony (service indicator 16)
- Fax G2/G3 (service indicator 17)