Well Lync licensing is divided in two parts. Server and client.
Lets start and look at the server side, you need a server license, it can be either a Standard server or a Enterprise server, and if you are ok with just one server and no high availability the standard server is ok. If you want HA you should go with the enterprise server. And then there is the rest of the server roles, but from a licensing perspective we don’t need to think so much about that regarding Lync. For the full details look here
Ok so what about the client side? Well there are three different Client Access Licenses that we need to learn about.
Standard CAL – Basic IM/Presence functionality.
Enterprise CAL – Meetings and conferencing
Plus CAL – Telephony
And what about the infrastructure? There are some different server roles but the main ones are the Front end servers, the edge servers, and the mediation server role.
Then there are some supporting roles like director, monitoring, archiving, group chat, backend (SQL) to see how they work together have a look here http://zoom.it/36Qq
Now take a look at this page from Cisco, for just 10 seconds and come back to me in the comments with what I need if I’m about to go Cisco Unified (really, they actually calls this unified?) Communications…
Its about 150 products listed and I have no clue what is needed??