User cannot dial out to a PSTN number as a guest in an online meeting in a Lync Server 2013 environment

Symptoms

Consider the following scenario:

You create a conferencing policy, and then you enable the following policy settings in a Microsoft Lync Server 2013 environment:
- Allow anonymous participants to dial out
- Allow participants not enabled for Enterprise Voice to dial out
You apply the policy to two users (user A and user B), and then you set the telephony mode to PC-to-PC only.
User A starts an online meeting.
User B joins the meeting as a guest, and then user B dials a public switched telephone network (PSTN) number.

In this scenario, user B cannot dial out to the PSTN number. Additionally, user B receives the following notification in the Meeting window:

You've left the call

This issue occurs because the dial-out call is routed incorrectly to the Edge server instead of the Mediation server.

To resolve this issue, install the following cumulative update:

3001616 October 2014 Cumulative Update 5.0.8308.831 for Lync Server 2013 (Front End Server and Edge Server)

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