1. A method for registering user endpoint devices via a network edge device in a Next Generation Network (NGN), the method comprising the steps of: at a Domain Name System (DNS) load balancer, monitoring a rate of DNS queries for an address of a target network edge device in the NGN; receiving from the user endpoint devices a flow of DNS queries for the address of the target network edge device for use in registering in the NGN; if the rate of DNS queries is below a threshold rate for the target network edge device, then forwarding the flow of DNS queries to a DNS server; and if the rate of DNS queries is above the threshold rate for the target network edge device, then throttling the flow of DNS queries.