SRV, which is an abbreviation for Service, is a DNS record, which enables you to employ a domain name for a specific service different from an Internet site. By setting up a number of SRV records, you can use the domain name with different providers and direct it to numerous servers at the same time, every single server handling a different service. You are able to specify the port number for the connection to each machine, so there will never be any interference. You can also set different priorities and weight for 2 records that are used for the same service, but forward to different servers for redundancy or load balancing. Using an SRV record you can employ your domain name or a subdomain under it for a Voice-Over-IP server, for instance, and have the actual software running on a number of machines with different providers. Which one a client of yours is going to use depends on the priority and weight values that you've set.