Direct SIP
The easiest and generally most cost-effective way of integrating Lync Server with an existing PBX is if the PBX supports SIP trunks. Many IP PBXs support this functionality, and many other hybrid PBXs support SIP trunks with additional hardware and software upgrades.
In Direct SIP scenarios, the Mediation Server role (which can now be collocated with a Front End Server) serves as the conversion point between the two systems. The signaling on both sides of the server is SIP, but the Mediation role translates the media stream between G.711 on the PBX side and RTAudio on the Lync Server side. A logical overview of a Direct SIP connection is displayed in Figure 17.6.
Figure 17.6 Direct SIP Integration
Direct SIP integration allows for ...
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