SRV, which is an abbreviation for Service, is a DNS record, which enables you to use a domain for a specific service different from an Internet site. By creating a few SRV records, you can use the domain address with different providers and forward it to numerous servers at once, each server handling a separate service. You could specify the port number for the connection to each and every machine, so there will not be any interference. You could also set different priorities and weight for two records which are employed for the same service, but point to different servers for redundancy or load balancing. Using an SRV record you can employ your domain name or a subdomain under it for a Voice-Over-IP server, for instance, and have the actual software running on a number of machines with different companies. Which one a customer of yours will use will depend on the priority and weight values that you have set.