Consider your doings and don't ignore the warnings. I give you an overview about what some customers were planning.
During you setup you had chosen MYCLOUD.AG and now you want to delete this SIP domain and change it to NEWSIP.COM
Sure your uses can have a new SIP domain assigned. Well, they will than need to log out and in once it has change, so also their buddy list gets updated.
Well, Federated contact are never updated...
There are several RtcApplications, Conferencing, Auto Test Service, Group Chat Server and much more (RSG, CAA,...). Those applications have also SIP addresses assigned. They are written to the Lync Active Directory Configuration and are also present in the Lync SQL databases.
If you change the SIP Domain via the Topology Builder, there is even a serious warning:
Get-CsApplicationEndpoint also reflect those applicat…