FRITZ!Box 7390 Service - Knowledge Base
Maximum number of calls over FRITZ!Box
If you have configured several Internet telephone numbers in the FRITZ!Box, you can conduct up to five Internet calls over the FRITZ!Box at the same time.
If you cannot conduct more than one call, then 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 allows you to conduct up to three calls at the same time using the DECT base station and up to two calls at the same time over your landline and/or the Internet using the "FON S0" port. With IP telephones, you can conduct a maximum of two Internet calls at the same time.