Basic Requirements for Enabling a Lync User for PSTN Dial-In Conferencing

The world of UC and Lync is complex – especially when it comes down to remembering specific details of what configuration is required to enable specific feature sets. One of the goals of this blog has always been to make it extremely easy to remember basic important details at a moments notice.

Recently I had to reacquaint myself (again!) with the steps for enabling a user for PSTN dial-in conferencing.

Once the Lync system is completely configured and able to host PSTN dial-in conferences, the four key requirements you need to remember about enabling a Lync user are:

  1. They do NOT need to be enabled for Enterprise Voice.
  2. To DO need a LINE URI set.
  3. They DO need a Dial Plan assigned.
  4. They DO need a Lync Conferencing Policy assigned which has “EnableDialInConferencing” set.
    • This conference policy also determines whether users can use specific functionality during a conference such as invite anonymous participants. See the Lync Conferencing Policy Parameters for all the conferencing options.

I always seem to forget #2. And for reference, when #2 is not set, but the user is enabled for dial-conferencing, the user will get the following error message when trying to set their dial-in conferencing PIN:


Fully deploying dial-in conferencing for a Lync deployment is a much broader subject – worthy of several blog posts – but from the point of view of enabling a user in a smaller deployment, one of the most important things to understand is the relationship between the Enterprise Voice feature set and the Dial-In Conferencing feature set.

The key here is you that while you do not need to completely deploy Enterprise Voice, you do need enable Lync to receive incoming PSTN calls, configure and assign Lync Dial Plans, and ensure that the Dial Plans have regions assigned to them. The regions associate conference dial-in access numbers with the dial plans.

A good checklist summary for deploying PSTN dial-in conferencing is described in this Microsoft TechNet article: Deployment checklist for dial-in conferencing in Lync Server 2013.

Lastly, be sure that the Online Meeting Outlook Add-In for Lync is deployed and available for your users. This add-in makes it really easy for users to schedule a dial-in conference – the dial-in information is added to the meeting invite when the user schedules a Lync meeting in Outlook. For Lync 2013, the add-in is installed automatically when the full Lync 2013 client is installed.  The meeting invitation can be customized (see Configuring the meeting invitation in Lync Server 2013 for more information).

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