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 couple of SRV records, you will be able to use the domain name with different companies and direct it to numerous servers at a time, each server managing a separate service. You can specify the port number for the connection to every machine, so there won't be any interference. You can also set individual priorities and weight for 2 records which are employed for the same service, but direct to different servers for redundancy or load balancing. With an SRV record you can use your domain address or a subdomain under it for a Voice-Over-IP server, for instance, and have the specific software running on several machines with different providers. Which one a client of yours will use is determined by the priority and weight values that you've set.