Your network contains an analog TDM-PBX. You plan to transition the telephony infrastructure to Lync Server 2010. You need to recommend a solution that meets the following requirements:
* Ensures that all users can initiate calls to the PSTN.
* Prevents internal calls from being routed through the PSTN.
* Ensures that all TDM-PBX users and Lync Server 2010 users can call each other.
Which two components should you include in the recommendation? (Each correct answer presents part of the solution. Choose two.)

A.
SIP trunk

B.
Media Gateway

C.
Edge Server

D.
Director

E.
Mediation Server

Explanation:
No prooflink here, but decent analog PBX integration requires Gateway and Mediation Server for transcoding.