I have set up internally a Microsoft Lync Server 2010. Internally, users are able to use it. I now need to configure it for external use for clients and employees outside of our network. I believe this should be a matter of setting up external DNS forwarders & firewall configuration settings. We have a Cisco 1811 router on the edge of our network. Internally it is entirely a Microsoft Domain.
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it would have been helpful if you clarified what is "external access" is it 1. your external IP network 2. telephony gateway ie sip,h233 or mgcp 3. or a SIP trunk to Cisco UCM