I use HMP with ipm as bellow code: char str[MAX_STRING_SIZE]; //---------inband mode-------- IPM_PARM_INFO parmInfo; unsigned long ulParmValue = DTMFXFERMODE_INBAND; parmInfo.eParm = PARMCH_DTMFXFERMODE; parmInfo.pvParmValue = &ulParmValue; ipm_SetParm(voice[index_voice].deviceInfo[IPM].devH, &parmInfo, EV_ASYNC); But when i press key, I must wait 10s to received from my program. what is wrong? it's by MSC or how to setting in HMP. This is my capture file pcap. http://www.mediafire.com/download/wv6c7wu94j45676/0203_1.pcap
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