SRV, which is an abbreviation for Service, is a DNS record, which enables you to employ a domain name for a specific service different from a site. By creating a few SRV records, you can use the domain with different providers and direct it to numerous servers simultaneously, every single server handling a different service. You are able to specify the port number for the connection to every single machine, so there will not be any interference. You can also set individual priorities and weight for 2 records which are used for the exact same service, but direct to different servers for redundancy or load balancing. With an SRV record you can employ your domain or a subdomain under it for a Voice-Over-IP server, for instance, and have the real software running on various machines with different companies. Which one a client of yours is going to use will depend on the priority and weight values which you have set.