SRV, which is an abbreviation for Service, is a DNS record, which allows you to use a domain for a specific service different from an Internet site. By creating a number of SRV records, you will be able to use the domain address with different companies and point it to numerous servers at once, every single server handling a different service. You are able to specify the port number for the connection to each machine, so there will never be any interference. You may as well set different priorities and weight for two records which are employed for the very same service, but forward to different servers for redundancy or load balancing. By having an SRV record you can use your domain address 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 will use will depend on the priority and weight values you have set.