Thursday, August 15, 2013

Lync 2013 clients perform DNS lookup

Just want to share Lync 2013 clients perform DNS lookup in the following order:

1. lyncdiscoverinternal.   A (host) record for the Autodiscover service on the internal Web services.
2. lyncdiscover.   A (host) record for the Autodiscover service on the external Web services.
3. _sipinternaltls._tcp.   SRV (service locator) record for internal TLS connections.
4. _sipinternal._tcp.   SRV (service locator) record for internal TCP connections (performed only if TCP is allowed).
5. _sip._tls.   SRV (service locator) record for external TLS connections.
6. sipinternal.   A (host) record for the Front End pool or Director, resolvable only on the internal network.
7. sip.   A (host) record for the Front End pool or Director on the internal network, or the Access Edge service when the client is external.
8. sipexternal.   A (host) record for the Access Edge service when the client is external. (This is very rarely used.)

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