If the FRITZ!Box is connected to a remote network via VPN, the VoIP accounts (internet telephone numbers) entered in the FRITZ!Box can login to a SIP server in the remote network over the VPN connection. Calls can then be made to a SIP server over the VPN connection. However, we do not guarantee that this function can be used.

Important:Enter the IP address of the SIP registrar and not its host name in the account information for the internet telephone number in the FRITZ!Box. The IP address must be from the VPN target network range.