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And add some printf at voice.c when run bb, i used one c118, I can see that the voice data from L2/L3 to L1, and got some data from L1(the first char is 0xd) at l1ctr.c l1ctr_traffic_ind. All seem ok, but the called phone can not hear any data that LCR send, and the LCR also can not get any useful data. Especially I still can hear voice form C118 speaker that the called phone send, and the called phone can hear that the voice data the C118 michone send. But I already changed the audio mode in gsm48_rr.c at gsm48_rr_init. please give me some advice. best regards shrek