SRV, which is an abbreviation for Service, is a DNS record, which allows you to employ a domain name for a specific service different from a website. By creating a few SRV records, you’re able to use the domain address with different providers and point it to a number of servers at the same time, each and every server handling a different service. You could specify the port number for the connection to every machine, so there will never be any interference. You may as well set individual priorities and weight for 2 records that are used for the very same service, but point to different servers for redundancy or load balancing. Using an SRV record you can use your domain address or a subdomain under it for a Voice-Over-IP server, for example, and have the specific software running on several machines with different companies. Which one a customer of yours is going to use depends on the priority and weight values you have set.