SRV, which is an abbreviation for Service, is a DNS record, which enables you to employ a domain for a particular service different from a site. By creating a few SRV records, you’ll be able to use the domain name with different companies and point it to numerous servers simultaneously, every single server managing a separate service. You can specify the port number for the connection to each and every machine, so there will not be any interference. You can even set individual priorities and weight for two records that are used for the very same service, but forward to different servers for redundancy or load balancing. Using an SRV record you can use your domain or a subdomain under it for a Voice-Over-IP server, for instance, and have the specific software running on several 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.