SRV, which is an abbreviation for Service, is a DNS record, which enables you to use a domain name for a particular service different from an Internet site. By setting up a few SRV records, you’ll be able to use the domain with different companies and direct it to a number of servers at once, each server handling a separate service. You could specify the port number for the connection to every machine, so there will not be any interference. You could also set different priorities and weight for 2 records which are used for the very same service, but direct to different servers for redundancy or load balancing. Using an SRV record you can employ your domain or a subdomain under it for a Voice-Over-IP server, for instance, and have the real software running on several machines with different providers. Which one a customer of yours is going to use depends on the priority and weight values that you have set.