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Knowledge document #3605

Internet telephone numbers from Deutsche Telekom behind a Speedport Hybrid are not registered

The FRITZ!Box is used behind a Speedport Hybrid. Since updating FRITZ!OS, the internet numbers from Deutsche Telekom are no longer registered in the FRITZ!Box.

Cause

  • To allow the use of Deutsche Telekom's "CompanyFlex" plan, the new FRITZ!OS takes the provider's NAPTR record into account, which redirects the transport protocol of the internet telephone numbers to TLS.

Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.

1 Switching the Telekom internet telephone number to UDP

The following step is only necessary if the internet telephone number does not belong to a SIP trunk from Deutsche Telekom:

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click the (Edit) button for the Telekom internet telephone number.
  4. Select "Other provider" from the "Telephony provider" drop-down list.
  5. Click "Additional Settings" to display all of the settings.
  6. In the section "Additional Settings for the Connection", select "UDP" from the drop-down list "Transport protocol".
  7. Click "Apply" to save the settings.

2 Adjusting the number format

Changing the telephony provider to "Other provider" also changes the format of the telephone number and it has to be corrected, otherwise your own telephone number is not displayed correctly in the call list and call-by-call does not work:

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click the (Edit) button for the Telekom internet telephone number.
  4. In the section "Telephone Number Format", for example for Berlin (030), enable "None" for the country code and "With prefix (030)" in front of the number ("Area code").
  5. Enter the suffix 00*;0*49;0*0#CbC# in the field "Suffix for internet telephone numbers".
  6. Click "Apply" to save the settings.
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