SRV, which is an abbreviation for Service, is a DNS record, which enables you to employ a domain for a specific service different from an Internet site. By creating a number of SRV records, you can use the domain with different companies and forward it to several servers at once, each and every server managing a separate service. You'll be able to specify the port number for the connection to each machine, so there will not be any interference. You can also set individual priorities and weight for two records which are employed for the exact same service, but direct 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 instance, and have the actual software running on various machines with different providers. Which one a customer of yours is going to use will depend on the priority and weight values that you have set.