SRV, which is an abbreviation for Service, is a DNS record, which enables you to employ a domain name for a certain service different from an Internet site. By creating a number of SRV records, you’ll be able to use the domain with different companies and forward it to a number of servers simultaneously, every single server handling a separate service. You could specify the port number for the connection to each and every machine, so there will not be any interference. You may as well set different priorities and weight for 2 records which are used for the exact same service, but point to different servers for redundancy or load balancing. By having an SRV record you can use your domain or a subdomain under it for a Voice-Over-IP server, for example, and have the real software running on several machines with different providers. Which one a customer of yours will use depends on the priority and weight values you have set.