SRV, which is an abbreviation for Service, is a DNS record, which enables you to use a domain for a certain service different from an Internet site. By creating a couple of SRV records, you’ll be able to use the domain with different companies and direct it to many servers at once, each and every server managing a separate service. You can specify the port number for the connection to every single machine, so there will not be any interference. You can even set different priorities and weight for 2 records which are used for the very same service, but point to different servers for redundancy or load balancing. With an SRV record you can employ your domain address 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 providers. Which one a client of yours will use will depend on the priority and weight values you have set.