SRV, which is an abbreviation for Service, is a DNS record, which permits you to employ a domain name for a specific service different from a site. By creating a number of SRV records, you’ll be able to use the domain with different providers and forward it to numerous servers at once, each and every server handling a different service. You'll be able to specify the port number for the connection to each and every machine, so there will never be any interference. You could also set different priorities and weight for 2 records that are used for the very same service, but point to different servers for redundancy or load balancing. With an SRV record you can use your domain or a subdomain under it for a Voice-Over-IP server, for example, and have the specific software running on several machines with different providers. Which one a client of yours will use is determined by the priority and weight values that you've set.