SRV, which is an abbreviation for Service, is a DNS record, which permits you to use a domain for a certain service different from a site. By creating a number of SRV records, you’ll be able to use the domain with different providers and point it to several servers at the same time, each and every server managing a different service. You could specify the port number for the connection to each machine, so there won't be any interference. You may as well set different priorities and weight for 2 records that are used for the exact 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 real software running on a number of machines with different companies. Which one a customer of yours will use will depend on the priority and weight values that you have set.
