Cardiff, UK, January 17, 2006 — Ubiquity Software Corporation (LSE: UBQ.L), a leading provider of SIP-based communications software for service providers, ISVs and OEMs around the world, today announced it has entered into a three-year agreement with AT&T Services, Inc., a subsidiary of AT&T Inc. (NYSE:T).

Under terms of the agreement, Ubiquity will provide its SIP (Session Initiated Protocol) Application Servers for testing and possible use in delivering new, enhanced broadband services over an integrated Voice over IP (VoIP) network planned for AT&T customers.

About Ubiquity

Ubiquity Software Corporation plc, listed on the Alternative Investment Market of the London Stock Exchange (LSE: UBQ.L), develops and markets SIP-based communications software to service providers, ISVs and OEMs around the world. Its award-winning SIP Application Server (SIP A/S) is both a carrier-class deployment platform and a programmable, standards-based application creation environment (ACE) that allows customers to develop and deploy next-generation converged communications services. Ubiquity assists customers to accelerate the creation of customized SIP applications through its Professional Services Organization. The company is headquartered in Cardiff and has corporate offices in the US and Canada and representation in Japan and China. For more information, please visit www.ubiquitysoftware.com or email This e-mail address is being protected from spam bots, you need JavaScript enabled to view it