Lync Express with SIP Trunking
Lync Express can be configured to PSTN calls through the equipped Session Border Controller (SBC). The SBC will receive the call via its internal interface, and pass it out the external interface to a SIP Trunk. Please see the illustration below which displays a network diagram of how everything is related and configured.
In this scenario, it is important to note the roles required for the successful operation of Lync Express:
- Active Directory Domain Controller
- Lync Mediation Server with Front End Pool
- Session Border Controller
- Lync Edge Server
- Reverse Proxy Server through IIS ARR.