static uc_check_event_t check_event;
static uc_call_control_t call_control;
static uc_new_t create_new;
static uc_error_message_t error_message;
static uc_get_device_handles_t get_device_handles;
static uc_channel_open_t channel_open;
static uc_channel_close_t channel_close;
static uc_channel_set_api_codec_t channel_set_api_codec;
static uc_channel_write_t channel_write;
static uc_channel_flush_t channel_flush;
static uc_channel_gains_t channel_gains;
static uc_channel_echo_cancel_t channel_echo_cancel;
static uc_channel_switching_t channel_switching;

uc_protocol_t protocol_descriptor =
{
    "mfcr2",
    "E1 MFC/R2 signalling",
    "MFC/R2",
    "dz\0"
    "ar\0"
    "bh\0"
    "bo\0"
    "br\0"
    "cl\0"
    "cn\0"
    "co-land\0"
    "co-cell\0"
    "cz\0"
    "cd\0"
    "eg\0"