I am deploying a Lync Server 2010 in a datacenter and I need to know witch ports do I need to open in the data center firewall so lync clients can connect.
The important question is what are you trying to support? Lync uses different groupings of ports/protocols for different use cases (server-to-server, client-to-server, client-to-client) so understanding your topology is key.
The link you provided is for the Edge Server which does not cover internal servers. More details about your topology will help here.
TCP: 443,5061,50000:59999,3478
UDP: 443,50000:59999,3478
Did I open something that didn't need to?