SRV, which is an abbreviation for Service, is a DNS record, which allows you to use a domain name for a specific service different from an Internet site. By creating a number of SRV records, you’re able to use the domain name with different companies and point it to several servers at once, every single server managing a separate service. You could specify the port number for the connection to each machine, so there will not be any interference. You can also set different priorities and weight for two records which are used for the exact same service, but direct to different servers for redundancy or load balancing. By having an SRV record you can employ your domain name or a subdomain under it for a Voice-Over-IP server, for example, and have the actual software running on various machines with different companies. Which one a customer of yours is going to use depends on the priority and weight values that you've set.