Controlling registration floods in VOIP networks via DNS

摘要

A mechanism controls global synchronization, or registration floods, that may result when a large number of endpoints in a Voice over Internet Protocol (VoIP) network such as an Internet Protocol Multimedia Subsystem (IMS) come online simultaneously after a catastrophic failure. The mechanism allows the Domain Name System (DNS) infrastructure to efficiently control the overload condition by registering user end points with backup border elements, and by staggering and by randomizing the time-to-live (TTL) parameter in registrations with backup border elements.

主权项

1. A method for registering a multimedia endpoint via a border element in a multimedia network, the method comprising:
at a domain name system server in the multimedia network, receiving a domain name system query from the multimedia endpoint, the query containing an identifier of the multimedia end point and requesting an address of the border element for use in registering for a multimedia service; based on the identifier of the multimedia end point, determining a primary border element associated with the multimedia end point; by maintaining a running window of a number of domain name system queries processed for the primary border element, determining that a volume of domain name system queries from endpoints associated with the primary border element is above a threshold capacity of the primary border element; determining a backup border element associated with the multimedia end point; by maintaining a running window of a number of domain name system queries processed for the backup border element, determining that a volume of domain name system queries from endpoints associated with the backup border element is below a threshold capacity of the backup border element; and responding to the domain name system query with an identification of the backup border element for use by the multimedia endpoint in registering for the multimedia service.