If the FRITZ!Box is connected to a remote network via VPN, the SIP accounts (internet telephone numbers) entered in the FRITZ!Box can log in to a SIP server in the remote network over the VPN connection. It is then possible to conduct internet calls over the VPN connection to the SIP server. However, we cannot guarantee that this function can be used.

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