SRV, which is an abbreviation for Service, is a DNS record, which allows you to employ a domain for a certain service different from an Internet site. By creating a number of SRV records, you are able to use the domain address with different providers and direct it to numerous servers simultaneously, each and every server handling a different service. You can specify the port number for the connection to every machine, so there will not be any interference. You can even set individual priorities and weight for 2 records which are used for the exact 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 instance, and have the real software running on a number of machines with different companies. Which one a customer of yours is going to use depends on the priority and weight values that you have set.