SRV, which is an abbreviation for Service, is a DNS record, which permits you to employ a domain for a certain service different from an Internet site. By setting up a couple of SRV records, you will be able to use the domain name with different providers and point it to numerous servers at a time, every single server managing a different service. You could specify the port number for the connection to every single machine, so there will never be any interference. You can also set individual priorities and weight for 2 records that are used for the very same service, but direct to different servers for redundancy or load balancing. By having an SRV record you can use your domain name or a subdomain under it for a Voice-Over-IP server, for instance, and have the specific software running on several machines with different companies. Which one a customer of yours will use is determined by the priority and weight values that you've set.