STUN Server for the Connection of External VoIP Subscribers

Proceed as follows:

•Using the Configuration Manager (Administration > VoIP Configuration)

Requirements:

•VoIP channels (optional, see Technical Data in the Instructions)

STUN server

IP address or URL

Port

Requirements:

•support for public DNS mapping by the router on the PBX network

•call forwarding from the SIP port of the internal VoIP registrar to the PBX's IP address in the router

•configured DNS server

The STUN server entered here can be used to connect to external private branch exchanges.

Note: If all external private branch exchanges are connected to the PBX network via a VPN tunnel, no STUN server needs to be entered.

Note: If IP protocol IPv6 is selected, STUN cannot be used as a NAT method either for SIP or RTP.

Note: The page Overviews > Ports shows an overview of the PBX ports (incoming and outgoing).