Aircall, the software developer from France of a cloud-based business phone system and call center solution, enjoyed solid gains in revenue and in the size of its customer base in North America, following a brisk bout of expanded operations on the continent, the company noted in a recent news release.

Aircall said its revenue in North America increased 26% six months after it had secured $120 million in a Series D funding that also saw its valuation grow to more than $1 billion. During the same period, from June to December this year, the company’s customer base in North America grew 24%, as part of a 75% year-over-year (YoY) uptick in its worldwide customer base that brings the current Aircall total to 10,000 customers in more than 100 countries, Aircall noted.

The company also surpassed the goal it had set for its worldwide employee headcount. At the start of the year, Aircall had intended to cap global hiring at 270 employees. By November, however, the company’s hires had exceeded 300 in number, bringing its total employee count to more than 600, consisting of 35 different nationalities.

“We’ve reached a few milestones this year,” said Sandrine Meunier, chief people officer at Aircall, “but hitting the 600-employee mark emphasizes the amazing growth we’re experiencing as a company.”

With demand in the US for cloud-based call centers and phone systems increasing, Aircall also embarked on an aggressive expansion of its headcount throughout North America, while strengthening partnerships with Salesforce and HubSpot.

Founded in 2014 in Paris, which remains its headquarters location, the Aircall system is intended to help manage and streamline customer support and sales engagement operations. Designed for offices and teams in remote areas, Aircall enables users to integrate the software with client relationship management (CRM) and helpdesk systems to manage calls directly. So far, the company has raised more than $226 million in venture capital funding.