FRITZ!Box 7390 Service - Knowledge Base
Calls to an analog landline number are signaled with a delay
There is a delay before calls to your analog landline number are signaled. Callers hear a ringing tone a number of times before your telephone rings or the "Fixed Line" LED on the FRITZ!Box lights up to signal the call.
Simply proceed as described below. After each measure, check whether the issue persists.
1 Determining the length of delay
- Check how long it takes for the "Fixed Line" LED to light up on the FRITZ!Box after the caller hears the first ringing tone.
- If no more than four seconds elapse, then the delay is normal due to technical reasons and there is no error.
2 Disabling SMS and MMS support in the telephone
The telephone reacts quicker to calls when SMS and MMS support is disabled:
- Disable SMS and MMS support in the telephone connected to the FRITZ!Box. Refer to the device's manufacturer for information on how to set it up, for example consult the manual.
3 Having your provider activate CLIP
The FRITZ!Box signals incoming calls with a shorter delay if the provider activated CLIP for your line. The following step is only necessary if you do not see the caller ID on the display of your telephone when you receive a call:
- Have your telephony provider activate the service "Calling line identification presentation (CLIP)" for your landline.
ATTENTION!You may be charged for activating it. Ask your telephony provider about charges in advance!
4 Testing whether another device is interfering with the FRITZ!Box
Interference from a device connected to the FRITZ!Box or the power mains may be reaching the FRITZ!Box. Therefore, perform the following test:
- Remove all devices and cables from the LAN ports and the USB port on the FRITZ!Box. If no devices are connected, connect a computer to a LAN port on the FRITZ!Box.
- If the issue no longer occurs, then a device connected to the FRITZ!Box was transmitting interference to the FRITZ!Box or the computer now channels it off. Usually, you can eliminate the cause of the interference through one of these measures:
- Use a power strip to connect the FRITZ!Box and all other connected devices to the same electrical outlet.
- Test different electrical outlets and power outlet strips.
- Use UTP network cables to connect devices to the LAN ports on the FRITZ!Box. Unlike STP network cables, for example the one included with delivery, UTP network cables do not have a ground wire and do not transmit interference to the FRITZ!Box.
Important:If the problem occurs with a FRITZ!Powerline adapter, use the UTP network cable included with the FRITZ!Powerline adapter.
- If a device connected to the USB port is transmitting interference to the FRITZ!Box, do not connect the device to the FRITZ!Box. Instead, connect it to a USB port on your computer.
If there is still a delay before incoming calls are signaled, then the issue is not caused by the FRITZ!Box. Instead, it is caused by a different component (such as telephone, cable, power supply).