Woopla provides telecommunication solutions for business and residential clients. Services include low cost international calls, SIP/VoIP termination, service numbers, and more. Among its value added services, woopla provides an Alert Call API, allowing applications and web services to execute outgoing voice calls. Woopla creates a customized voice dialogue which is automatically executed when the other side picks up the phone. Suggested uses include PIN queries, phone number verification, and appointment reminders.