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 site. By creating a number of SRV records, you’re able to use the domain address with different companies and direct it to a number of servers simultaneously, 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 will not be any interference. You can even set different priorities and weight for 2 records which are used for the very same service, but forward 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 example, and have the real software running on a number of machines with different providers. Which one a customer of yours is going to use will depend on the priority and weight values that you have set.