SRV, which is an abbreviation for Service, is a DNS record, which permits you to use a domain for a specific service different from a site. By creating a few SRV records, you can use the domain address with different companies and direct it to several servers at the same time, each server managing a separate service. You are able to specify the port number for the connection to each machine, so there will not be any interference. You could also set individual priorities and weight for 2 records that 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 name or a subdomain under it for a Voice-Over-IP server, for instance, and have the real 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 have set.
