Wireless Industry Leaders Conduct First Joint Push-to-Talk over Cellular - PoC - Interoperability Tests.

Business Editors/High-Tech Writers

STOCKHOLM, Sweden--(BUSINESS WIRE)--March 16, 2004

Ericsson, (NASDAQ:ERICY) Motorola, Siemens and Sony Ericsson plan Interoperable Products & Solutions for Q2 2004. Ericsson, Motorola, and Siemens announced today the first joint interoperability tests for Push-to-Talk over Cellular (PoC) technology. The tests are designed to help provide network operators with easy integration, interoperability and a competitive environment in which to deploy commercial PoC service. For consumers, the testing helps ensure a simple, seamless Push-to-Talk experience.

The PoC function enables mobile phones to be used like walkie-talkies, providing communication at the touch of a button. Already popular in North America, PoC is poised for growth in Europe and in Asia - but interoperability is a key factor to such broad-based acceptance.

The first technical standard specification for Push-to-Talk - PoC Phase One - was submitted to the Open Mobile Alliance (OMA) in August 2003. Ericsson, Motorola, Siemens and Sony Ericsson are promoting a final version of the PoC standard through the OMA.

Today, the industry leaders take the next step by successfully starting joint interoperability tests to help speed delivery of compatible PoC solutions to network operators. The first interoperable products and solutions are expected to be introduced in Q2 2004. Other manufacturers are encouraged to join the interoperability tests to help ensure compatibility between devices and PoC servers across vendors.

About Push-to-Talk over Cellular service