Cloud communications company Twilio is expanding into four new European countries, days after striking a major deal with Microsoft to spread its voice and messaging APIs to developers on the Windows Azure platform.

The San Francisco-based company is today launching phone numbers in Belgium, Finland, The Netherlands and Sweden for use with the Twilio Voice API, which is used to make and receive telephone calls programmatically.

It thus expands its availability to a total of 10 European countries in addition to the US and Canada, with Italy, Spain and Portugal still in ‘beta’.

Twilio provides a telephony infrastructure web service in the cloud, allowing Web developers to integrate phone calls, text messages and IP voice communications into their Web, mobile and phone applications.

The company has raised close to $34 million in funding from the likes of angel investors Mitch Kapor, Chris Sacca and Manu Kumar, and VC firms Union Square Ventures, Founders Fund and Bessemer Venture Partners.