Microsoft Exchange and Lync 2013 Integration Process

In Exchange Server 2013 

In Exchange Mgmt Shell

https://FQDN/metadata/json/1

In Exchange Mgmt Shell :
"C:\Program Files\Microsoft\Exchange Server\V15\Scripts\Configure-EnterprisePartnerApplication.ps1 -AuthMetaDataUrl 'https://FQDN/metadata/json/1' -ApplicationType Lync"

iisreset of Exchange Server

In Lync Server 2013

In Lync Mgmt Shell :

https://autodiscover.domain.com/autodiscover/metadata/json/1

New-CsPartnerApplication -Identity Exchange -ApplicationTrustLevel Full -MetadataUrl "https://autodiscover.domain.com/autodiscover/metadata/json/1"

To Test connectivity between two - Lync and Exchange 

Test-CsExStorageConnectivity -SipUri "sip:firstname.lastname@cyberoam.com"