New Skype4B Hybrid Setup - On-Prem has no Presence for Online Users

Sorry for the absence.  Real life getting in the way of work stuff.

We have about 6,000 dirsynced accounts in the on-premises SIP domain and another 23K that exist only in the cloud and are not dirsynced in a separate SIP domain space.

We updated all the DNS entries for the cloud SIP domain (lyncdiscoverinternal, lyncdiscover, _sipinternaltls._tcp, etc.) and the cloud accounts stopped being able to sign in (or at least my test account).  It looked to me like it was trying to authenticate to the on-premises domain controllers but I might be mistaken.

We removed the DNS entries so that accounts with the SIP domain for the cloud environment pointed to Skype4B Online when logging in and I was able to log in with in a cloud only account again.

Now, the cloud users and the on-premises users can see each other's presence if they are in the contact list, or if you have opened a conversation window with them  at some point (regardless of whether you send an actual message).

If you just use the search feature to find a new contact, you get "Presense Unknown."

I'm not sure I understand what's going on but it's better than before.



I think my next steps are to observe what happens when I migrate on-premises users to the cloud.  I can't migrate (existing) cloud users on-premises because they are not dirsynced (that's another battle for another day).

Thanks for your help and being understanding of my (very) strange setup.