DNS Requirements for Mobility

Internal DNS records

You need to create one of the following internal DNS records:

Record type Host name or SRV definition Resolves to
CNAME lyncdiscoverinternal.<sipdomain> Internal Web Services fully qualified domain name (FQDN) for your Director pool, if you have one, or for your Front End pool if you do not have a Director
A (host)  lyncdiscoverinternal.<sipdomain> Internal Web Services IP address (virtual IP (VIP) address if you use a load balancer) of your Director pool, if you have one, or of your Front End pool if you do not have a Director

External DNS records

You need to create one of the following external DNS records

Record type Host name Resolves to
CNAME lyncdiscover. <sipdomain> External Web Services FQDN for your Director pool, if you have one, or for your Front End pool if you do not have a Director
A (host) lyncdiscover. <sipdomain> External or public IP address (VIP address if you use a load balancer) of the reverse proxy
SRV _sipfederationtls._tcp. <sipdomain>Resolves to host (A or AAAA) record for the Access Edge service To support Push Notification Service and Apple Push Notification service, you create one SRV record for each SIP domain that has Microsoft Lync Mobile clients.Important:

This requirement applies only to Microsoft Lync Mobile clients on Apple or Microsoft based mobile devices. Andriod and Nokia Symbian devices do not use push notification.

Note:

Lyncdiscover, also known as autodiscover, traffic goes through the reverse proxy. SRV record points to a record that resolves through the Access Edge service

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