I need to get public certificates for on premise lync 2013 installation primarily for lync online and skype federation.
I want to double check things because I don't want to spend more than strictly necessary.
There is standard front-end server, mediation server (connected to telephony provider sip trunk), edge server and reverse proxy server (IIS AAR).
Configured is a single sip domain, which is the same as e-mail domain (domain.com) and different from AD domain (domain.local)
Installation is currently use for internal and external access from PCs and mobile devices, enterprise voice, IM, meetings, external companies federation,
On reverse proxy external interface is used the same certificate as on front-end server, which contains also some domain.local SANs.
I need to know which certificates I need to change and if on those certificates are needed domain.local SANs.
RapidSSL certificates will work for skype and lync online federation?