Call Loop is a unique player in the marketplace, providing the ability for users to dispatch SMS messages and voice calls with the same ease of use that people get from email marketing companies like Constant Contact or MailChimp.
The application is built as a service oriented architecture (SOA) that uses PHP for the front-end and doing all data management through SOAP communications with the .NET backend written in CSharp and using a MS SQL Server database. Additionally there is a CSharp application that synchronizes the user's data with one of a large collection of list providers including Constant Contact, Mail Chimp, iContact, AWeber and more. SMS and voice calling tasks are also handled through web service calls to providers and the user charging and accounting services are also services. It is truly a distributed mashup type application using the best providers instead of writing things in-house.