Patent ID: 8995252
Filing Date: 2015-03-31
Classification: H04L

Abstract:
1. A communications method, comprising: receiving a user request to initiate a telephonic connection from a local site, using a VoIP telecommunication device which has by itself no functionality to failover to transfer traffic onto at least one backup tunnel in the event of a link failure; establishing over wide area network links at least two VPN tunnels between a controller at the local site and another controller; and transmitting VoIP traffic over at least one of the VPN tunnels from the controller at the local site to the other controller; wherein the establishing step includes an inviting location initiating an SIP/SDP INVITE at least in part by sending to an invited location an SIP/SDP INVITE packet and includes sending to the invited location a primary IP address of the inviting location and a backup IP address of the inviting location in a request packet, and includes the inviting location receiving from the invited location in a response packet a primary IP address of the invited location and a backup IP address of the invited location.