World's First Remote 3G-324M Interoperability Testing Service

Europe : RADVISION announced the availability of the world's first remote 3G-324M interoperability testing service. The service, which will provide vendors of 3G-324M terminals and servers with a full scale, comprehensive testing facility to test pertinent interoperability issues, introduces a new level of IOT (Interoperability Testing). RADVISION's remote testing platform is built on test cases defined by RADVISION and the IMTC (International Multimedia Teleconferencing Consortium), the internationally recognized authority for multimedia standards interoperability.

Two of the most pressing interoperability issues in 3G video telephony today focus on CCSRL and WNSRP. CCSRL is a mechanism defined by the ITU-T recommendation H.324 / Annex C for segmentation and reassembly of large control frames. The IMTC 3G-324M activity group recently noted that the size of a data unit (CCSRL-SDU) must be limited to 256 octets; however, the maximum size of an NSRP command that packs a CCSRL segment is 2048 octets. Supporting CCSRL is mandatory for 3G-324M equipment vendors as part of the standards effort to ensure reliability of H.245 messages exchange. Vendors will be able to conduct tests against a remote reference terminal that supports sending and receiving CCSRL-SDUs up to 2048 octets.

The second issue that has become central to 3G-324M interoperability concerns the proposed WNSRP standard. WNSRP presents an elegant answer to the challenge of reducing call setup time and has been widely adopted by a large majority of the world's leading 3G vendors and mobile operators. The method is based on NSRP (Numbered Simple Retransmission Protocol) as defined in H.324 Annex A and calls for an additional windowing mechanism that allows faster call setup time by removing the dependency between sent and received messages thereby reducing the amount of round trips required in the call setup stage.

RADVISION's remote IOT service will be available free of charge during the upcoming months on a prescheduled basis using a remote ISDN or WCDMA connection. Testing companies will receive a complete report of the test session that will provide information on call flow, statistics, and interoperability based on the performance of the terminal under test. The test results are confidential and will be sent solely to the vendor who performs the testing.