Twilio, the provider of an application programming interface for voice communications, is reportedly raising upwards of $50 million in a Series D financing. The San Francisco-based company enables phones, VoIP and messaging to be embedded into web, desktop and mobile software. Twilio has raised over $33 million in funding to date, from investors including 500 Startups, Bessemer Venture Partners, Union Square Ventures and Founders Fund, among others.
