Released on = March 20, 2007, 9:18 am

Press Release Author = MRB-PR

Industry = Telecommunications

Press Release Summary = Support for Popular Low Bit-Rate Codec Improves Speech
Quality for Users

Press Release Body = BURLINGTON, MA and NEW YORK - March 20, 2007 - iBasis, Inc.
(NASDAQ: IBAS), the global VoIP companyT, and SolegyT, a provider of a managed
service delivery platform for VoIP, IMS and other next generation services, today
announced at VON Spring 2007 that they have interconnected to deliver high quality
public switched telephone network (PSTN) termination to users of the EarthLink®
MindSpringSM PC-to-Phone calling service. The combination of capabilities from
iBasis and Solegy enables the Earthlink service to utilize the iLBC codec, a
narrowband speech algorithm designed to optimize calls made over the Internet.
Solegy, Earthlink's managed platform provider, has incorporated the iLBC codec,
ensuring quality of service (QoS) for MindSpring callers. The iLBC codec performs
better than commercially available alternatives in situations where the caller's
Internet link may suffer from lost or delayed IP packets. iBasis is the only major
wholesale carrier with the technological capabilities to support iLBC and provide
interconnection to Solegy.
"Not wanting to sacrifice optimized calling for MindSpring's users, we were
determined to find a wholesale carrier who could interoperate with us on this iLBC
codec," said Eric Hernaez, CEO and co-founder of Solegy. "Naturally, we were
delighted to learn iBasis could support this option. We believe both EarthLink and
its many MindSpring customers will recognize and appreciate the improved quality
provided through the iLBC technology, and we look forward to working with iBasis to
deliver this high service level."
"We're committed to selecting best-of-breed partners who maintain EarthLink's
standards for quality," said Craig Forman, president of Access and Audience at
EarthLink. "By working with Solegy and iBasis, we can continue providing consistent,
premium service to our softphone users."
\"The consumer VoIP market is growing rapidly, and emerging providers all over the
world need access to high quality termination to fixed-line PSTN and mobile phones,\"
said Ofer Gneezy, president and CEO of iBasis. \"With the iBasis DirectVoIP
BroadbandT service, consumer VoIP providers like Earthlink can take full advantage
of the most advanced codecs, including iLBC, to deliver high quality service for a
wide variety of devices and applications.\"
Solegy's ServicePDQT platform, which EarthLink utilizes for the MindSpring dial-out
service, takes full advantage of iBasis' global VoIP network to provide high-quality
PC-to-phone calling at reduced rates. Enabled by the ServicePDQ platform, MindSpring
users can access a Web portal offering convenient, single-click self-provisioning,
as well as customer self-service. In addition, ServicePDQ's SIP softswitch
architecture supports real-time billing for MindSpring-originated calls to
traditional PSTN phone lines.

About iBasis
Founded in 1996, iBasis (NASDAQ: IBAS) is a leading wholesale carrier of
international long distance telephone calls and a provider of retail prepaid calling
services, including the Pingo® web-based offering (www.pingo.com) and disposable
calling cards that are sold through major distributors and available at retail
stores throughout the U.S. iBasis customers include many of the largest
telecommunications carriers, including AT&T, Verizon, China Mobile, China Unicom,
IDT, Qwest, Skype, Telecom Italia, Telefonica, and Yahoo. iBasis carried more than
11 billion minutes of international voice over IP (VoIP) traffic in 2006, and is one
of the largest carriers of international voice traffic in the world . The Company
can be reached at its worldwide headquarters in Burlington, Massachusetts, USA at
781-505-7500 or on the Internet at www.ibasis.com.
About SolegyT
SolegyT provides a managed service delivery platform for VoIP, IMS and other next
generation services to quickly and easily manage and deploy new applications and
back-office services. Through Solegy, service providers can launch new services
through a wider variety of applications with minimal cost. Solegy also acts as a
reseller for third-party application development regardless of platform or broadband
connection. These service solutions are developed for use with IP and IMS-based
networks and applications. Solegy pre-built applications include SOHO Broadband,
Voice VPN, Wholesale Peering, Calling cards and Callback. Built on the Solegy
ServicePDQ platform, all Solegy solutions provide a real time, operator-grade
session management and back-office environment. Solegy is based in New York City,
with offices in San Jose, Toronto and Manila. For more information please visit
www.solegy.com.

iBasis and Pingo are registered marks of iBasis, Inc. The global VoIP company is a
trademark of iBasis, Inc. Solegy, the Solegy logo, OpenSourceSIP, OpenSIPStack and
ServicePDQ are trademarks of Solegy LLC. All other trademarks are the property of
their respective owners.


Except for historical information, all of the expectations, projections and
assumptions contained in the foregoing press release, including those relating to
iBasis' current expectations regarding revenue growth, sources of revenue, margin
improvement, profitability, future capital expenditures, and cash flows constitute
forward-looking statements under the Private Securities Litigation Reform Act of
1995 and involve risks and uncertainties. Important factors that could cause actual
results to differ materially from such forward-looking statements include, but are
not limited to, (i) the extent of adoption of iBasis' services and the timing and
amount of revenue and margin generated by these services; (ii) fluctuations in the
market for and pricing of these services; and (iii) the other considerations
described as \"Risk Factors\" in iBasis' most recent Forms 10-K and 10-Q, and the
company\'s other SEC filings. iBasis has no current intention to update any
forward-looking statements.

# # #


Web Site = http://

Contact Details = Chris Ward
iBasis, Inc.
781-505-7557
cward@ibasis.net
http://www.ibasis.net

Marty Querzoli
Davies Murphy Group, Inc. (PR for iBasis)
781-418-2433
ibasis@daviesmurphy.com
http://www.daviesmurphy.com

Justine Schneider
MRB Public Relations
(PR for Solegy)
732-758-1100 x106
jschneider@mrb-pr.com
http://www.mrb-pr.com