SRV, which is an abbreviation for Service, is a DNS record, which allows you to employ a domain for a certain service different from a website. By setting up a number of SRV records, you’re able to use the domain with different providers and point it to numerous servers simultaneously, each server managing a different service. You'll be able to specify the port number for the connection to every single machine, so there won't be any interference. You may as well set different priorities and weight for 2 records which are employed for the exact same service, but direct to different servers for redundancy or load balancing. With an SRV record you can employ your domain address or a subdomain under it for a Voice-Over-IP server, for instance, and have the actual software running on several machines with different providers. Which one a customer of yours will use depends on the priority and weight values you have set.