Upcall
Upcall provides outbound call professionals as a service.
https://www.upcall.com
Upcall helps hundreds of companies acquire, qualify, engage and retain more customers through outbound phone calls.
Upcall's platform and API give 24/7 access to 1000s vetted US based callers as well as various tools to manage call campaigns effectively such as script templates, call analytics and recording, as well as integrations with client's existing workflow (Slack, Salesforce, Google Calendar, Outlook, ...).
Upcall was part of the prestigious Y Combinator.