Our 3rd party phone provider is currently experiencing intermittent connectivity. Our Support Operations team is working with them to restore service as soon as possible. If you need immediate support please feel free to chat (my.wpengine.com) or create a ticket (help.wpengine.com) with our team and we are available to assist.
Update: It appears our 3rd party phone provider has resolved the intermittent connectivity issues. Our Support Operations team will continue to monitor the situation but several test phone calls have connected successfully.