SRV, which is an abbreviation for Service, is a DNS record, which enables you to employ a domain name for a particular service different from a website. By setting up a few SRV records, you’re able to use the domain name with different companies and forward it to several servers at a time, 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 can also set individual priorities and weight for 2 records which are used for the same service, but direct to different servers for redundancy or load balancing. With an SRV record you can employ your domain 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 customer of yours will use is determined by the priority and weight values that you've set.