SRV, which is an abbreviation for Service, is a DNS record, which permits you to employ a domain name for a particular service different from a website. By setting up a number of SRV records, you’ll be able to use the domain address with different providers and direct it to several servers at the same time, every single server managing a different service. You'll be able to specify the port number for the connection to every machine, so there will not be any interference. You can also set individual priorities and weight for two records which are employed for the same service, but forward to different servers for redundancy or load balancing. With 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 customer of yours is going to use is determined by the priority and weight values you have set.