SRV, which is an abbreviation for Service, is a DNS record, which allows you to employ a domain for a specific service different from an Internet site. By setting up a few SRV records, you are able to use the domain address with different providers and point it to a number of servers at once, each and every server handling a separate service. You can specify the port number for the connection to each machine, so there will not be any interference. You can even set different priorities and weight for two records that are used for the very same service, but forward 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 specific software running on various machines with different companies. Which one a customer of yours will use is determined by the priority and weight values that you have set.