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Knowledge document #361

FRITZ!App Fon

This support document is available for the following products:

Telephony devices and automated telephone system cannot be controlled remotely

Although you can make telephone calls, you cannot remotely control telephony devices or automated telephone systems on other lines. For example, you cannot:

Operate the automated telephone system of a telephone hotline.
Remotely control an answering machine on another line.
Call an answering machine connected to the FRITZ!Box and control it remotely (for example to listen to new messages).
Enter a PIN for telephone banking.

Simply proceed as described below. After each measure, check whether the problem is solved.

1 Installing the latest FRITZ!OS

Install the latest FRITZ!OS on the FRITZ!Box.

2 Testing different DTMF transmission methods

The following steps are only necessary if you use the FRITZ!Box to conduct calls over the internet (VoIP):

Click "Telephony" in the FRITZ!Box user interface.
Click "Telephone Numbers" in the "Telephony" menu.
Click the (Edit) button for the respective internet telephone number.
Select "Other provider" from the drop-down list, even if you are using a preconfigured internet telephony provider.
Click "Additional Settings" to display all of the settings.
Try different settings for the "DTMF transmission" in the "Additional Settings for the Telephone Number" section or ask your internet telephony provider which setting you need to select.
Click "Apply" to save the settings.

Besides these settings, the FRITZ!Box has no influence on whether the tones are distorted when they are transmitted to the line that was called. For example, if the internet telephony provider sends DTMF tones over the voice channel, individual tones can be distorted by other signals. In this case, a solution on the part of the FRITZ!Box is not possible.