deltathree to Present Conference Session at INTERNET TELEPHONY Conference & EXPO Fall 2005

Paul White to Discuss Service Providers Migration to Next Generation VoIP Offerings at Leading VoIP Event in Los Angeles Convention Center

New York , October 14, 2005 — deltathree (NasdaqSC: DDDC) today announced that Paul White, Chief Financial Officer of deltathree, has accepted an invitation to present a session titled, "Migrating to VoIP: A Service Provider Round Table” at TMC’s INTERNET TELEPHONY® Conference & EXPO Fall 2005 on October 27th, 2005 at the Los Angeles, California Convention Center. deltathree will be further honored with the 2005 INTERNET TELEPHONY VoIP Service Provider Award presented by TMC President Rich Tehrani and IPCC Chairman Michael Khalilian to Paul White.

INTERNET TELEPHONY® Conference & EXPO, held October 24-27, 2005, is the world’s largest and best-attended VoIP trade show. Last February, the show drew over 6,200 buyers and sellers of VoIP products and services to Miami. For this upcoming October show, TMC projects total attendance to exceed 7,500.

Paul White stated, “I am honored to have been asked to present at this industry leading event. The INTERNET TELEPHONY Conference & EXPO provides a valuable forum for the developers of next generation VoIP technologies and solutions to meet with industry partners and customers to help expand the global VoIP ecosystem. As a leading provider of VoIP platforms to some of the world’s largest communications companies, deltathree is uniquely positioned to provide service providers of all sizes insight into how they can successfully navigate their own migration to a next generation VoIP offering.”

“We are very pleased that Paul will be participating in this year’s show. deltathree is widely recognized and respected as an industry leader, and I am confident that our attendees will appreciate and value the opportunity to hear Paul’s perspective on how service providers can manage the migration to a VoIP platform,” said TMC president and conference co-chair, Rich Tehrani. “Over the past twelve months, widespread adoption of VoIP by global service providers, businesses and governments has reinforced that this exciting technology is a viable, cost-effective communications solution. As a result, we are seeing a significant number of senior-level executives attending INTERNET TELEPHONY Conference & EXPO as a means of learning about the technology so they too can take advantage of its benefits.”

Registration for the show is now open. Anyone interested may register by visiting http://www.itexpo.com.

About deltathree

Founded in 1996, deltathree is a leading provider of hosted, Session Initiation Protocol (SIP)-based VoIP products, services and infrastructure. deltathree offers customers high quality Internet telephony solutions that are viable and cost-effective alternatives to traditional telephone services. Supporting hundreds of thousands of active users around the world, deltathree serves customers through its three primary distribution channels: the Outsourced Platform Solution, the Reseller Program and iConnectHere. deltathree's customized Outsourced Platform Solution offers service providers worldwide a broad range of private label VoIP products such as PC-to-Phone and Broadband Phone, as well as a robust back-office suite of services such as billing, operations management, web development, and network management. Supporting a global network of resellers, deltathree’s Reseller Program offers a quick and efficient solution for Internet cafes, call shops and small Internet service providers to enter the VoIP telecommunication services market. iConnectHere, deltathree's consumer division, provides award-winning VoIP products directly to consumers and small businesses online.

For more information about deltathree please visit our website: www.deltathree.com

About TMC®

Technology Marketing Corporation (TMC) publishes two print magazines: Customer Inter@ction Solutions, and Internet Telephony; five digital publications, SIP Magazine, Speech-World, WiFI Telephony Magazine, VoIP Developer, WiMAX Magazine; and the online publications TMCnet.com, Planet PDA Magazine, WiFi Revolution, Alternative Power and BiometriTech. TMC is also the first publisher to test new products in its own on-site laboratories, TMC Labs. TMC also produces The VoIP Developer Conference, Speech-World Conference, IP Contact Center Summit and The Global Call Center Outsourcing Summit. TMCnet.com publishes more than 20 topical online newsletters. For more information about TMC, visit its Web site at www.tmcnet.com.