The initial public offering (IPO) for RingCentral Inc. (NYSE: RNG) has arrived. It turns out that this is a hot IPO as well. If you had read our preview back at the time of the filing, this deal’s warm reception should be no surprise at all. The initial filing was for up to $100 million, and the deal priced 7.5 million shares at $13.00 each.

This story was updated for trading analysis.

Of the 7.5 million shares, only 80,000 were being sold by selling holders. Goldman Sachs, J.P. Morgan Securities and Bank of America Merrill Lynch were the joint book-running managers. Allen & Company and Raymond James were listed as the as co-managers in the syndicate.

RingCentral is a great business used by many thousands of customers. It offers software-as-a-service (SaaS) solutions for business communications. It also supports widespread workforces and mobile employees. The company’s flagship product is RingCentral Office, an enterprise-grade communications solution to communicate with voice, text and fax on multiple devices including smartphones, tablets, PCs and desk phones.

Why you have to care about this IPO is that RingCentral’s customer base is made up of more than 300,000 businesses. Its main focus is small and medium-sized businesses of less than 1,000 employees in the United States and Canada. The company also is making investments to target larger customers, and it believes that it can see an additional growth opportunity in international markets.

Sales have grown from $50.2 million in 2010 to $78.9 million in 2011, and up to $114.5 million in 2012. For the first six months of 2012 and 2013, revenues grew from $51.8 million to $73.2 million, respectively.

Update at 10:18 a.m. We have seen some 2.5 million shares traded. The stock opened at $17.25 and shares were up 40% at $18.25 on last look.

FIRST LOOK at 9:45 a.m.: The first indication is $14 to $17, and we are awaiting shares to open for trading.

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