Tham khảo tài liệu 'mobile messaging technologies and services phần 10', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 392 Mobile Messaging Technologies and Services performed against the latest version of the ETS. A number of test reports provide the outcome of the test sessions. Bilateral testing between manufacturers this method is similar to an OMA test fest except that it involves only two vendors and tests are usually conducted in the premises of one of the vendors. Testing by an OMA approved test house this method consists of mandating a third party to conduct interoperability tests on behalf of OMA members. Once interoperability tests have been successfully conducted for a given device then the device vendor can claim that the device conforms to a given MMS enabler release. This of course is a guarantee for the vendor s customers that the device is interoperating efficiently with other devices also conforming to the same enabler release. Implementations of Different Versions of the MMS Protocol As shown in this chapter each MMS protocol data unit is marked with an MMS version . versions or . A PDU of higher version may have more parameters than the equivalent PDU marked with a lower version. Furthermore certain PDU for a given version may not have any equivalent PDU in the protocol of a lower version . the dedicated PDU for read reports is defined in MMS version but is not available in MMS version . Communicating MMS devices MMSC and MMS clients can conform to different versions of MMS an MMS client conforms to MMS communicating with an MMSC conforming to MMS . Consequently the MMS standard OMA-MMS-Enc from version includes a number of rules for ensuring that such heterogeneous MMS devices interoperate effectively. The MMS version marking a PDU over the MM1 interface value assigned to the X-MMS-Version parameter is composed of a major version number and a minor version number as shown in Figure . Two scenarios can occur for communicating MMS devices conforming to different versions of the MMS protocol 1. Devices conform to the same
