I' ll do this! Thank you!

@MisterW No, not really. I got the information that the registration of each number is failing and it seemd to be a DNS problem. Not more.

No, the Fritzbox is configured as a client w/o NAT or router funktion. ;)

This was not successful. I restarted the Fritzbox after the setting. Perhaps the 707 router should also be restarted .... . I also added DMZ to the IP of the Fritzbox for port forwarding.

Please excuse the unclear wording! Behind an Omada ER707M2 there are various APs and a Fritzbox which is intended solely for the operation of a few DECT telephones. On the WAN side of the 707 there...

Hello! I use an ER707M2, an OM200 and various APs. A Fritzbox, which only has DECT active, will be used for telephony. This worked for a short time and then the O2 SIP numbers in Germany could no...