Hi Asiaviking,
Welcome to post in our forum.
Regarding this issue, I agree with Martin.
As a supplement, PSTN calling is an add-on to
Skype Cloud PBX that allows you to search for, acquire, and assign phone numbers to users in your organization so that they can make calls to and receive calls from people inside and outside of the organization, directly from Office 365. Users who are assigned
phone numbers can make voice calls across all Skype for Business devices, including VoIP phones, PCs, and mobile devices. They also can control their calls through mute/unmute, hold/resume, call transfers, and call forwarding features, and if necessary, make
emergency calls.
If you want to set up PSTN calls for Skype for business, you need to enable enterprise voice firstly, the following document is about how to setup PSTN call for skype for business, please refer to
https://support.office.com/en-us/article/Set-up-PSTN-Calling-for-Skype-for-Business-57893158-1acd-44ac-acaf-19f58264a9e0
If you want to record your PSTN call, please try the method in the following article
https://voxogo.zendesk.com/hc/en-us/articles/201136092-Record-a-PSTN-call-on-the-SfB-Lync-client
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please
make sure that you completely understand the risk before retrieving any suggestions from the above link.
Regards,
Alice Wang
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