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The Basic gateway and Basic Hybrid gateway are the gateway types supported by Microsoft for Office
Communications Server 2007 R1 and Office Communication Server 2007 R2.
The difference between the Basic gateway and the Basic Hybrid gateway is in the location of the Microsoft
Mediation Server:
Basic gateway – the Mediation Server is located externally to the gateway
Basic Hybrid gateway – the Mediation Server is hosted on the gateway platform
Microsoft® LyncTM introduces a new set of supported gateways, providing additional functionalities such as
network survivability, load balancing of Mediation Servers for incoming calls, early media, forking, and SRTP.
For Lync Server, the gateway types are replaced as follows:
Enhanced Gateway – replaces the Basic gateway
Survivable Branch Appliance (SBA) – replaces the Basic Hybrid gateway