Knowledge Base
AVM Content
- FRITZ!Box 7690
- FRITZ!Box 7590 AX
- FRITZ!Box 7590
- FRITZ!Box 7583 VDSL
- FRITZ!Box 7583
- FRITZ!Box 7582
- FRITZ!Box 7581
- FRITZ!Box 7560
- FRITZ!Box 7530 AX
- FRITZ!Box 7530
- FRITZ!Box 7520
- FRITZ!Box 7510
- FRITZ!Box 7490
- FRITZ!Box 7430
- FRITZ!Box 7360
- FRITZ!Box 6890 LTE
- FRITZ!Box 6850 5G
- FRITZ!Box 6850 LTE
- FRITZ!Box 6840 LTE
- FRITZ!Box 6690 Cable
- FRITZ!Box 6670 Cable
Conducting internal calls
If several telephones are connected to your FRITZ!Box, you can conduct (free) internal calls between the telephones. For example, you can use a cordless telephone to call a telephone connected to an analog extension of the FRITZ!Box.
Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.
1 Preparations
Telephones that are connected to the "FON S0" socket on the FRITZ!Box either directly or via an ISDN telephone system (PBX) cannot automatically be reached internally. Although the FRITZ!Box assigns an internal number to the telephones during setup, this telephone number must still be assigned in the telephone or the telephone system:
Configuring a telephone in the FRITZ!Box
- Click "Telephony" in the FRITZ!Box user interface.
- Click "Telephony Devices" in the "Telephony" menu.
- Configure all of the telephones connected to the "FON S0" socket as ISDN telephones. To do so, click the "Configure New Device" button and follow the instructions.
Important:The wizard's ring test does not work due to an error in the FRITZ!Box. Click "Yes" when you are asked "Is the telephone ringing?", even if the telephone does not ring.
- If you connected an ISDN telephone system to the FRITZ!Box, also configure all of the analog telephones connected to this telephone system as ISDN telephones in the FRITZ!Box. To do so, click the "Configure New Device" button and follow the instructions.
Assigning an internal number in the FRITZ!Box
- Click "Telephony" in the FRITZ!Box user interface.
- Click "Telephony Devices" in the "Telephony" menu.
- Click the (Edit) button for the relevant ISDN telephone.
- Select the internal number, for example 52, from the drop-down list "Number of the terminal device".
- Click "OK" to save the settings.
Assigning an internal number in a telephone
- Assign the internal number to the ISDN telephone as the incoming telephone number. If the telephone is connected to a telephone system, assign the telephone number to the extension of the telephone system instead of to the telephone.
2 Conducting internal calls
Configuring a telephone to use the keypad function
Keypad sequences are strings of characters and numbers that you can use to enable or disable functions. You can use keypad sequences immediately with telephones, such as FRITZ!Fon C5, that are registered with the base station of your FRITZ!Box. If you want to use them with a telephone connected to the "FON S0" port or a cordless telephone that is not registered with the FRITZ!Box's base station, you must enable the keypad function first:
- Configure the telephone so you can send keypad sequences (sequences of characters and numbers, such as *121#) and enter special characters such as * and # with it. On many telephones, you can configure this function in the menu "Operation at a PBX > Dialing options > Dial * and #".
Making internal calls
- If you want all of the telephones connected to the FRITZ!Box to ring, enter **9 to make a broadcast call. You then conduct the call with the party who answers the telephone first.
- If you want a specific telephone to ring, enter ** followed by the internal number of the telephone.
Example:
To call a telephone connected to the "FON 1" socket, enter **1.Note:You can find the internal numbers of the telephony devices in the FRITZ!Box user interface under "Telephone Book > Internal Numbers".
- If you want a specific telephone to ring, enter ** followed by the internal number of the telephone.