Wednesday, February 5, 2014

DNS records for automatic Sign-in in Lync with different version.



DNS is important for Sign-in Lync client however there some DNS record however it is depending on the version we are using (Lync 2013, Lync 2010, or Store app), the client will query the DNS for a list of specific records, and as soon as one of them is resolved, the client will use it for authentication.

Lync 2013:

1.     lyncdiscoverinternal.,

2.     lyncdiscover.,

3.     _sipinternal._tcp.,

4.     _sip._tls., sip.,

5.     sipexternal.
Note: you need to create above record.

Lync 2010:

1.     _sipinternal._tcp.,

2.     _sip._tls.,

3.     sip.,

4.     sipexternal.
Note: you need to create above record.

Store app and client for mobile devices

1.     lyncdiscoverinternal.,

2.     lyncdiscover.


A (Host) and SRV record format:




The lyncdiscoverinternal. Host (A) record is tried first.
This record should only be available to hosts with acesss to the internal DNS servers, so external clients (not connected via VPN) should typically receive no response for this query and then move on to the next.
The lyncdiscover. Host (A) record is then attempted and would be the preferred first resolution for external clients.
If neither of these records is resolvable then the legacy DNS Service Locator Record (SRV) and Host Record (A) fall-back process is used.  The Lync 2013 Windows Store app actually stops here and does not advance further.

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