Thomas.Poett@TEAMS (MVP Teams and Cross-Tenant Migration Specialist)

Working with PSTN Conferencing in your Office 365 Skype for Business Online Tenant. ID PSTN -> SfBOnlUsr call Start and instant (Impromptu) Meeting or schedule a Online Meeting as usual from Outlook or your Client App.  After the meeting is escalate into ConfCall, the MCU SfB OnLine Server will send reinvite to MediationServerHybrid. This is illustrated in the drawings below. First we have a look into the outbound call to a PSTN user:   Next, we have a look into the inbound call from a PSTN user:   Configure online hybrid Mediation Server Settings The setup process is curial and needs to be follow as below:   When a P2P call is escalated to a PSTN conference, the Skype for Business Online conferencing server will send an invite to the Cloud Connector Mediation Server. To ensure that Office 365 can route this invite successfully, you need to configure a setting in your online tenant for each Cloud Connector Mediation Serv...

You can force joining a Skype for Business Conference in browser: Solution To force connecting to a Skype for business meeting (conference) using the Skype for Business Web App instead of the Skype for Business Desktop Client, do the following: Open a web browser window Copy & paste the URL for joining the meeting that you received.  But do NOT press ENTER yet! Append the following string to the URL: “?SL=1” (without the double quotes) For example, if the URL to join the Skype for Business meeting given is: https://meet.simdom.com/thomas.poett/YR2RJ141 Change it to: https://meet.sipdom.com/thomas.poett/YR2RJ141?SL=1 Author: Thomas Poett MVP, Business Unit Lead Microsoft Unified Communication