Enhancing Skype for Business Online Meetings for external participants

With regards to point 5 "call me back" feature - we have a number of deployments whereby an anonymous external participant selects this web app option to call a PSTN number. The call is placed, but when answered by the PSTN party, a continuous ringtone is heard and audio to the meeting is not connected. I raised this on another tecnet post : https://social.technet.microsoft.com/Forums/lync/en-US/598730c6-145e-444b-b71b-8d33a2a60b07/anonymous-webapp-calls-dropping-with-youve-left-the-call?forum=sfbfr

The answer given is that this dial out feature is not actually supported for Web App as below:

"I would like to inform you that this was a bug and it will not be fixed as per the update from PG. As per the Product group they have clearly told that the dial out option is not supported through Web App in SFB anymore. They are planning on allowing audio join via PSTN option in the future, but will be limited to authenticated users as per the update."

Can you confirm if this is the case as Microsoft still show this feature in product articles ?