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Use an SRV Record to Enable Instant Messaging Clients for Live@edu

Applies to: Live@edu

Topic last modified: 2010-04-02

You use SRV records to allow instant messaging clients other than Windows Live Messenger to interact with users in your cloud-based domain.

What is a SRV record?

A SRV (service) record identifies a service that is provided for a domain. The following fields are required:

  • Service   The symbolic name of the service. The underscore character ( _ ) is always added to the beginning of the service name.
  • Protocol   The symbolic name of the Internet protocol, which is usually TCP or UDP. The underscore character ( _ ) is always added to the beginning of the protocol name.
  • Priority   The priority of the host server specified in the Target field for this particular service. A lower priority value indicates a preferred server.
  • Weight   A load-balancing mechanism that is used when more than one SRV record for a particular service has the same Priority value. Instead of accessing the servers defined in the Target field in random order, the server that has the highest Weight value is always accessed first.
  • Port   The TCP or UDP port of the service. The port number value is a 16-bit integer from 0 to 65535. The Internet Assigned Numbers Authority (IANA) maintains the official list of port number assignments for specific services.
  • Target   The domain name of the server that provides the service that is specified in the Service field. The server doesn't have to exist in the same domain as the SRV record itself.

What do I need to create an SRV record?

The SRV record that you configure for the cloud-based service must contain the following details:

  • Service   _sipfederationtls
  • Protocol   _tcp
  • Priority   10
  • Weight   2
  • Port   5061
  • Target   federation.messenger.msn.com