The full solution consists of a hub-and-spoke with VPN for data and VoIP control backup.

In this topology:

• There is a direct WAN connection to the Main Office for VoIP bearer and as primary VoIP control connection.

• The Broadband Internet connection uses cable or DSL modem, with a static public IP address

• There is a VPN tunnel to the hub over the Internet for intranet data, and as backup connection for VoIP control

• The local hosts access the Internet directly through the local broadband connection

• The PSTN connection backs up the voice bearer