estos.de

estos GmbH develops ProCall, unified communication and collaboration (UCC) software that combines telephony, messaging and collaboration in one application. The range includes ProCall Enterprise, ProCall NEX, ProCall Infinity for large enterprises, and ProCall for Microsoft Teams. The software works with multiple telephone systems and integrates with business applications such as DATEV and Microsoft Dynamics NAV.

Customers are organisations with communication-intensive processes, including health care, financial and public sector users. Products are sold through a partner network, and the company offers maintenance contracts, customer care and service level agreements, with installation and first-level support typically handled by partners.

estos was founded in 1997 as Electronic Software Tools Starnberg and is headquartered in Starnberg, Germany. The company reports over 600,000 users across industries and company sizes and a team of more than 90 people. Since 2025 it is part of the STARFACE Group under Gamma Communications plc, and since January 2026 its products have been distributed through Gamma Sales. Its career page lists openings in sales, development and customer success.

Product: ProCall UCC software: telephony, softphone, presence, messaging and collaboration in one desktop application, including ProCall for Microsoft Teams.