The only landline phone I have is a Gigaset VOIP provided by Sipgate.
The only other settings shown in the FRITZ!Box are these, plus my account name and password:
Connection Settings
The connection settings are already set to the most frequently used values. You can change these values if needed.
Change connection settings
Internet Connection
Maintain permanently (recommended for flat rates)
Delay disconnection by provider to the period between
0 - 11 - 22 - 33 - 44 - 55 - 66 - 77 - 88 - 99 - 1010 - 1111 - 1212 - 1313 - 1414 - 1515 - 1616 - 1717 - 1818 - 1919 - 2020 - 2121 - 2222 - 2323 - 24
Clear idle connection (recommended for time- or usage-based rates)
Clear automatically after seconds
Internet connection
Via the FRITZ!Box
Select this option if the FRITZ!Box is connected directly to your internet connection.
Via an external modem
Select this option if you would like to connect the FRITZ!Box to an existing external modem.
Data Throughput
Enter the speed of your line. These values are required to secure the prioritization of the network devices.
Downstream
Mbit/s
Upstream
Mbit/s
VLAN Settings
Please note that a VLAN ID is required only in special cases. The required ID was supplied by your internet service provider.
Use VLAN for internet access
VLAN-ID 101
PBit 0
PPPoE Passthrough
Enable this option only if you require an additional internet connection for a certain network device in the home network.
Attention:
Additional costs accrue for the internet connections established by connected network devices.
Connected network devices are also allowed to establish their own internet connections (not recommended)