SRV, which is an abbreviation for Service, is a DNS record, which enables you to use a domain for a certain service different from a website. By setting up a few SRV records, you’re able to use the domain address with different companies and forward it to a number of servers at the same time, each and every server managing a different service. You can specify the port number for the connection to each machine, so there will never be any interference. You can even set individual priorities and weight for two records which are employed for the exact same service, but point to different servers for redundancy or load balancing. By having 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 is going to use will depend on the priority and weight values that you've set.