If you have configured several internet telephone numbers in the FRITZ!Box, you can conduct up to four internet calls over the FRITZ!Box at the same time.

If you cannot conduct more than one call, your provider does not allow you to conduct several calls at the same time.

If your FRITZ!Box is connected to a landline (analog or ISDN), you can also conduct an additional call over an analog landline and two over an ISDN landline.

Note:The FRITZ!Box's DECT base station allows you to conduct up to three calls from your landline and/or over the internet at the same time. A maximum of two internet calls can be conducted at the same time using IP telephones.