ClickSend aims to improve business communications with the use of messages, e-mails, and voice systems. The goal of the PHP SDK is to ease the integration of SMS messaging into desktop and mobile applications. The requirements for developers include PHP 5.0, CURL enabled, and a ClickSend account.
Twilio introduced a new Fax API in Beta. The API allows connected apps to both send and receive faxes to and from legacy fax machines. While the API might seem counterintuitive, the business reality of today's marketplace continues to see many businesses across industries rely on fax communication.