Lync presence icon for person fields

Hi,

For any person field within SharePoint, we should see Lync presence icon in SharePoint 2013 (for any SharePoint versions). We have upgraded SharePoint 2010 to SharePoint 2013 in test environment. And upgraded database are restored in production environment.

1) Lync presence is being displayed in all the person fields in test environment

2) But in production lync presence icon is not being displayed.

We have already tried below options & no success,

http://sharepoint.stackexchange.com/questions/89896/sharepoint-2013-presence-blank

https://support.microsoft.com/en-us/kb/2813701

https://blogs.technet.microsoft.com/office_integration__sharepoint/2015/04/16/lync-presence-information-does-not-show-in-sharepoint-web-page/

https://deansuzuki.net/2014/04/11/lync-2013-presence-not-showing-up-in-sharepoint/

Can you pleas ehelp us on this issue?

Regards,

Manu

Regards, Manu