SRV, which is an abbreviation for Service, is a DNS record, which permits you to employ a domain name for a particular service different from a site. By setting up a couple of SRV records, you’ll be able to use the domain address with different companies and direct it to several servers at once, each and every server handling a different service. You can specify the port number for the connection to each machine, so there will not be any interference. You may as well set individual priorities and weight for two records that are used for the exact same service, but forward to different servers for redundancy or load balancing. With an SRV record you can employ your domain address or a subdomain under it for a Voice-Over-IP server, for example, and have the specific software running on several machines with different companies. Which one a customer of yours is going to use will depend on the priority and weight values you have set.