SRV, which is an abbreviation for Service, is a DNS record, which allows you to use a domain for a particular service different from an Internet site. By setting up a number of SRV records, you are able to use the domain with different companies and point it to numerous servers at once, each and every server managing a separate service. You could specify the port number for the connection to each and every machine, so there won't be any interference. You can also set different priorities and weight for two records which are used for the same service, but direct to different servers for redundancy or load balancing. With an SRV record you can employ your domain name or a subdomain under it for a Voice-Over-IP server, for example, and have the real software running on a number of machines with different companies. Which one a customer of yours will use is determined by the priority and weight values that you have set.