SRV, which is an abbreviation for Service, is a DNS record, which allows you to use a domain name for a specific service different from an Internet site. By creating a number of SRV records, you will be able to use the domain name with different providers and direct it to numerous servers at the same time, every single server handling a separate service. You'll be able to specify the port number for the connection to each and every machine, so there won't be any interference. You may as well set different priorities and weight for two records that are employed for the same service, but point to different servers for redundancy or load balancing. By having an SRV record you can employ your domain name or a subdomain under it for a Voice-Over-IP server, for example, and have the specific software running on several machines with different providers. Which one a client of yours will use depends on the priority and weight values that you have set.