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Knowledge document #3512

Setting up an ISDN door intercom system in the FRITZ!Box

You can set up an ISDN door intercom system in the FRITZ!Box and then use a telephone to accept door calls, speak with visitors, and open the door.

Requirements / Restrictions

  • Only functions that the door intercom system provides according to the specifications for EuroISDN/DSS1 can be used with it. Any proprietary functions (functions not defined in this standard) it offers cannot be used.

1 Connecting the door intercom system

  1. Connect the door intercom system to the "FON S0" socket on the FRITZ!Box.

2 Setting up a door intercom system

  1. Configure 99999 in the door intercom system as its MSN.

    Note:Outside line access is deactivated for ISDN devices connected to the "FON S0" socket that transmit "99999" as their MSN to the FRITZ!Box.

  2. If you want a specific telephone to ring, configure the internal number of that telephone in the door intercom system as the destination telephone number.

    Note:You can find the internal numbers of the telephones in the FRITZ!Box user interface under "Telephone Book > Internal Numbers".

    • If you want several telephones connected to the FRITZ!Box (call group) to ring, configure the quick-dial number, for example 701, of an internal call group as the destination telephone number.
    • If you want all of the telephones connected to the FRITZ!Box to ring, configure 9 to make a broadcast call.
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