3G mobile radio standards such as UMTS allow the use of mobile videotelephony to simultaneously transmit audio and video signals. For this purpose, standardization bodies have defined guidelines specifying that video phone calls be made via circuitswitched connections on the basis of the 3G-324M protocol. Whether a mobile phone functions in conformance with these guidelines can now be verified and, if necessary, certified for the first time by performing validated tests with the R&S CRTU-W protocol tester.
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