int linphone_core_enable_payload_type(LinphoneCore *lc, PayloadType *pt, bool_t enable);
-PayloadType* linphone_core_find_payload_type(LinphoneCore* lc, const char* type, int rate) ;
+PayloadType* linphone_core_find_payload_type(LinphoneCore* lc, const char* type, int rate, int channels) ;
int linphone_core_get_payload_type_number(LinphoneCore *lc, const PayloadType *pt);