Configuring ISDN Telephones
FRITZ!Box
38
5.4
Configuring ISDN Telephones
Up to eight ISDN phones can be connected to the
FRITZ!Box. Connect the ISDN telephones to the ISDN S
0
port
“FON S
0
”.
The following ISDN services are supported for Internet tele-
phony:
voice, telephony, audio 3.1 and fax G2/G3.
All other ISDN features are supported on the ISDN line. Out-
going connections with these ISDN service indicators are
automatically routed via the ISDN line.
Assigning Internet and Fixed-Line Numbers to ISDN
Telephones
If the connected ISDN telephones should only react to cer-
tain numbers, MSNs must be configured in the ISDN tele-
phones.
Proceed as follows to specify whether calls are conducted
on the fixed-line network or over the Internet:
No MSNs Are Configured in the ISDN Telephone
If no MSNs are configured in the ISDN telephone, the main
phone number is used for outgoing calls. The main number
is listed in the “Telephony / ISDN Terminal Devices” menu.
If the main number is a fixed line, all calls will be con-
ducted on the fixed-line network.
If the main number is an Internet number, all calls will
be conducted over the Internet.
MSNs Are Configured in the ISDN Telephone
If you specify an Internet number as the outgoing MSN
in the ISDN telephone, outgoing calls will be conduct-
ed over the Internet.
Internet numbers can be set up in the ISDN phone just
like MSNs.
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