STUN Server for the Connection of External VoIP Subscribers

Proceed as follows:

• Using the Configuration Manager (page 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).