Is there any Skype/E3 Add-ons for calling real phones internationally?
I have a customer that lives in sweden and travels alot. When he is out of the country he would like to use skype to call, instead of his phone. I know about something called pstn but I don't know if it's availible in Sweden and how to set it up. Does anyone have experience in with this service? And if so, how do you set it up?
You'll need an internation + domestic calling plan attached to the E3 subscription.
To enable this, you also need a phone system subscription.
have a look at the following article: https://docs.microsoft.com/en-us/skypeforbusiness/skype-for-business-and-microsoft-teams-add-on-licensing/license-options-based-on-your-plan/office-365-enterprise-e1-e3-e4
It's worth mentioning that there are two features related to PSTN (public switched telephone network):
Conferencing - this allows users to dial in to a conference bridge using a telephone number
Calling - this allows Skype to serve as the user's telephone for inbound and outbound calls
Based on your description, it sounds like you're interested in Calling, which is not currently available in Sweden according to this site: