The Office Communications Server perimeter network is home to three edge services, each of which handles a particular type of traffic across the corporate firewall:

For information about edge server configurations and topologies, see Planning for External User Accessin the Planning and Architecture documentation.

To enable conferencing with outside users, you must deploy an HTTP reverse proxy in your perimeter network. The reverse proxy manages distribution-group expansion, address book file download, and access to meeting content (such as slides) for outside users, as well as client and device software updates.

The following figure shows a generic deployment of edge servers in the Office Communications Server perimeter network.

Figure 1. Generic Edge Server deployment

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