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 an Internet site. By setting up a few SRV records, you can use the domain name with different providers and point it to many servers at the same time, each and every server handling a separate service. You are able to specify the port number for the connection to each and every machine, so there will not be any interference. You can even set individual priorities and weight for two records that are employed for the same service, but direct to different servers for redundancy or load balancing. With an SRV record you can use your domain name 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 will depend on the priority and weight values you have set.