Lync server 2013 single server setup

Is it possible to set up a single Lync 2013 server and give client access over the Internet without setting up an edge server.  This is a small environment and I can't really set up 2 servers for Lync.  It is working fine internally.  I have been looking all over to find a way to do this with no luck.  If it is possible what ports do I need to open on the firewall?
ktylmanAsked:
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Gajendra RathodSr. System AdministratorCommented:
Please check this link for single consolidated edge server with NAT.
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Steven SheeleyConsulting SW Engineer - Lync/Skype4BusinessCommented:
To answer your question Ktylman, no, you can not do what you are asking with only one server. You must have a minimum of 2 servers, one FE and one Edge. As the link above states and all Microsoft documentation indicates, you can not collocate FE and Edge on the same server and the edge must reside in your DMZ. Please see the below link for Lync 2013 supported topologies:

Lync 2013 Topologies
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Milind BhargavaCommented:
Can you recommend a good tutorial to setup the same?
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