SRV, which is an abbreviation for Service, is a DNS record, which enables you to use a domain name for a specific service different from an Internet site. By creating a number of SRV records, you are able to use the domain name with different providers and point it to numerous servers at once, every single server handling a different service. You can specify the port number for the connection to every single machine, so there won't be any interference. You may as well set different priorities and weight for two records that are employed for the very same service, but direct to different servers for redundancy or load balancing. Using 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 actual software running on a number of machines with different providers. Which one a client of yours will use depends on the priority and weight values that you have set.