deltathree Sets Reporting Date for Second Quarter 2008 Financial Results

NEW YORK, July 23, 2008 (PRIME NEWSWIRE) -- deltathree, Inc. (OTCBB:DDDC), a
leading provider of SIP-based Voice over Internet Protocol (VoIP) solutions for
service providers, resellers and end-users worldwide, will release financial
results for the second quarter 2008, ended June 30, 2008, before the opening of
trading on Thursday, August 14, 2008. deltathree's financial results will be
released over the news wire and will also be posted on the corporate website.

deltathree management will conduct a conference call to discuss the second
quarter 2008 financial results, which will be simultaneously webcast at 10:00
A.M. Eastern Time / 7:00 A.M. Pacific Time on Thursday, August 14, 2008.

To access the conference call, participants in North America should dial
1-877-260-8899 and international participants should dial 1-612-332-0720. A live
webcast of the conference call will be available on the investor relations page
of the deltathree corporate website at www.deltathree.com. Please visit the
website at least 15 minutes early to register for the teleconference webcast and
download any necessary audio software. A replay of the call will be available on
the website approximately two hours after the conference call is completed.

About deltathree

Founded in 1996, deltathree, Inc. is a leading provider of integrated Voice over
Internet Protocol (VoIP) telephony services, products, hosted solutions and
infrastructure. deltathree offers high quality Internet telephony solutions that
are viable and cost-effective alternatives to traditional telephone services.
Supporting tens of thousands of active users around the world, deltathree serves
customers through its two primary distribution channels: the Service
Provider/Reseller channel and the direct-to-consumer channel. deltathree's
advanced solutions offer service providers and resellers a full spectrum of
private label VoIP products and services, as well as a back-office suite of
services. Utilizing advanced Session Initiation Protocol (SIP) technology,
deltathree provides all the components to support a complete VoIP service
deployment. deltathree's Consumer Group consists of the iConnectHere
direct-to-consumer offering and joip, the newly formed consumer brand that
powers the VoIP service of Panasonic's GLOBARANGE hybrid phone.

For more information about deltathree please visit: http://www.deltathree.com.

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CONTACT: Grayling Global
Investor Relations Contact:
Erik Knettel
(646) 284-9415
ir@deltathree.com