External DNS records for Lync Online (Office 365)

Lync desktop client autodiscover

Type Host name Destination TTL

CNAME

sip.yourDomainName.com

sipdir.online.lync.com

1 hour

Lync mobile client autodiscover

Type Host name Destination TTL

CNAME

lyncdiscover.yourDomainName.com

webdir.online.lync.com

1 hour

Lync desktop autodiscover for anonymous (unauthenticated) users

Type Service Protocol Port Weight Priority TTL Name Target

SRV

_sip

_tls

443

1

100

1 hour

yourDomainName.com

sipdir.online.lync.com

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