The default static phone number when dialing into a Highfive meeting for our US-based customers is +1 628-444-4348.
If you hear a busy signal when joining a Highfive meeting by telephone, there may be congestion on the telephone network. Please try dialing any of the following alternate phone numbers first, followed by your meeting code:
For example, if your meeting's static dial-in number is +1 628-444-4348 and your meeting code is 4193972177#, try dialing +1-559-461-9567 instead, and then enter in your meeting code (4193972177#).
If you try the alternate phone numbers above and are still unable to join your meeting, please report the issue to our Support team for further investigation at firstname.lastname@example.org.