Hi, Currently, oFono expects the USSD string in UTF-8. ofono(Atom driver - AT or ISI) converts the UTF-8 string to GSM 7-bit default alphabet and sends it to the network. In this way, we will always send the data coding scheme as GSM 7-bit default alphabet or whatever the character set modem is configured. Why are we not sending the USSD string with DCS(Data coding scheme) as is to the network? There are USIM conformance test cases which expects the DCS(Data coding scheme) and USSD string sent as it is to the network. Also, as per the 3GPP TS 24.090, DCS and USSD string are sent as part of UnstructuredSS-Request to the network and MT is not expected to interpret the string. But ,here oFono doesn't have the interface to accept DCS(Data coding scheme) and also it expects the USSD string to be in UTF-8. Thanks and Regards, jeevaka
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