Key things to note when looking at the invitation

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Sometimes, a list of local numbers: For international meetings or meetings with participants in various locations, the invitation might include a link or a list of alternative local numbers to avoid long-distance charges. Look for text like "Find a local number." Clicking this link will usually take you to a Microsoft page listing available dial-in numbers worldwide.
Via Your Calendar (Outlook, Google Calendar, etc.): If you've accepted the meeting invitation, it will appear in your calendar. Open the calendar event for the Teams meeting. The meeting details within the calendar event will typically mirror the information found in the email invitation. Look for the "Join by phone" or "Audio conference" section to find the phone number and conference ID.


Availability of Audio Conferencing: The phone number will only be present in the switzerland phone number list invitation if the meeting organizer has an Audio Conferencing license assigned to their account and has enabled this option when scheduling the meeting. If you don't see dial-in details, it's likely that audio conferencing was not enabled for this specific meeting.
Organizer's Settings: The specific format and presentation of the dial-in information might vary slightly depending on the version of Teams and the organizer's account settings, but the core information (phone number and conference ID) will be present if audio conferencing is active.
Multiple Phone Numbers: Don't be surprised if you see more than one phone number listed. These are often alternative numbers or local numbers for different regions. Choose the one that is most convenient or cost-effective for you.
2. Within the Microsoft Teams Application (If the Meeting is Already Scheduled or Ongoing)

While the invitation is the primary source, you can also find the dial-in information within the Teams application itself, although the visibility might depend on whether you are already in the meeting or viewing a scheduled meeting.