When deploying voice capabilities on Lync, you’re going to need a gateway or two to interact with your legacy PBXs and the PSTN. My personal recommendations are the VX and UX series from NET, as they’re the most flexible and easiest to maintain and configure. Not to mention that NET are continually innovating their products and bringing new features to the marketplace.
Getting into setting up and configuring these devices can be a daunting task however. Web interfaces, device specific GUIs (VXbuilder and VXwatcher) and CLIs make it a different beast to Lync.
Fortunately, all the NET documentation and training you’ll need s available in one central place at the NET Online Support Centre. Specifically, technical documentation for the following products relevant to Lync Server 2010 are available here:
Configuration of SIP Gateway