After moving we needed DECT phones. We were very pleased with our previous Panasonic phone, we decided again for this brand. The registration of the phones on the Speedport W921V was done without any problems. The number assignment and work phone was also possible. That was it but also already. Neither could a phone book to be created - to the stored in the router phonebook could not be accessed - nor were the time and date displayed on the handsets. Internal call was also not possible. The manual also did not help, so we have written support from Panasonic. Even after several days, no reaction was carried out from there. We have therefore returned the phones.