SRV, which is an abbreviation for Service, is a DNS record, which permits you to employ a domain for a particular service different from a site. By creating a number of SRV records, you will be able to use the domain address with different providers and point it to many servers at the same time, each server handling a different 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 also set different priorities and weight for two records that are used for the exact same service, but point to different servers for redundancy or load balancing. By having an SRV record you can use your domain address or a subdomain under it for a Voice-Over-IP server, for instance, and have the specific software running on a number of machines with different companies. Which one a customer of yours is going to use is determined by the priority and weight values that you have set.