Hi, we have a UC520 which we are using for SIP trunking. We use it exclusively for making and receiving phone calls. If our DSL goes down, we obviously can't process calls so we're looking to implement some sort of redundancy.
My understanding is the UC520 product is aimed at small businesses and wasn't designed for built-in redundancy for VoIP calls as it only has one WAN connection F0/0. Therefore is the recommendation to purchase an additional router to put in front of the device and perform failover this way?
Thanks for any suggestions on this.