The A/V Edge Server is a STUN server. All users are authenticated to secure
both access to the enterprise and use of the fi rewall traversal service that the
A/V Edge Server provides. To send media inside the enterprise, an external
user must be authenticated and must have an authenticated internal user agree
to communicate with him or her through the A/V Edge Server. The media
48 Chapter 2 ??? Microsoft Offi ce Communications Server 2007
streams are exchanged by using the Secure Real-time Transport Protocol (SRTP),
which is an industry standard for real-time media transmission and reception over IP.
Keep in mind that you can install these edge servers on a single computer or on separate
computers. For reasons of economy and simplicity, the recommended deployment for most
organizations is to colocate the Web Conferencing Edge Server with the Access Edge Server
but to install the A/V Edge Server, which requires greater bandwidth, on a separate computer.
Group IM and data collaboration with external users also require deploying an HTTP
reverse proxy in the perimeter network.
Mediation Server
The OCS 2007 Mediation Server provides signaling and media translation between
the VoIP infrastructure and a basic media gateway. A Mediation Server also links OCS
2007 with a PBX in both the departmental deployment and PBX integration
topologies.
The Mediation Server is deployed as a stand-alone application inside the fi rewall. On the
OCS side, the Mediation Server listens on a single mutual TLS transport address.
Pages:
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108