I'm newbie when it comes to HA and failover. We currently have one Nortel 3120 connected to a T3 ATT to the internet for voice/data. This router then connected to PIX firewall and the PIX connected to a Cisco 2821 router for voice. We have another 3mb backup Cox to the internet. My question is how or what technology or hardware i should implement so that when the Nortel router failed or internet disconnected, it will automatically fail over and fail back when the primary internet is up.
Thank you for your time.