1. A method for registering user endpoint devices via a network edge device in a next generation network, the method comprising: computing a first threshold rate of session initiation protocol registration requests for a first target network edge device in the next generation network, the first threshold rate being based on a capability of the first target network edge device to process session initiation protocol registration requests; computing a second threshold rate of session initiation protocol registration requests for a second target network edge device in the next generation network, the second threshold rate being based on a capability of the second target network edge device to process session initiation protocol registration requests; at a domain name system load balancer, determining that a first flow of domain name system queries from the user endpoint devices for resolving a domain name of the first target network edge device exceeds the first threshold rate; at the domain name system load balancer, based on the determining that the first flow of domain name system queries exceeds the first threshold rate, throttling the first flow of domain name system queries; at the domain name system load balancer, determining that a second flow of domain name system queries from the user endpoint devices for resolving a domain name of the second target network edge device exceeds the second threshold rate; and at the domain name system load balancer, based on the determining that the second flow of domain name system queries exceeds the second threshold rate, throttling the second flow of domain name system queries.