137 lines
4.1 KiB
Plaintext
137 lines
4.1 KiB
Plaintext
1. User application sending variables or raw buffer to FreeTDM
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==============================================================
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The User can attach a ftdm_sigmsg_t to ftdm_caller_data_t before sending an event to freetdm.
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example #1 - Adding a variable:
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-------------------------------
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When using ftmod_sangoma_isdn, user want to specify progress indicator inside PROCEED message.
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ftdm_caller_data_t *caller_data;
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ftdm_sigmsg_t sigmsg;
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/* Attach variable to sigmsg */
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ftdm_event_add_var(&sigmsg, "isdn.prog_ind.descr", "inband-info-available");
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/* Attach sigmsg to channel's caller_data */
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caller_data = ftdm_channel_get_caller_data(ftdmchan);
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caller_data->sigmsg = &sigmsg;
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/* Request FreeTDM to send a PROCEED msg */
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ftdm_channel_call_indicate(ftdmchan, FTDM_CHANNEL_INDICATE_PROCEED);
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Note:
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1.When ftdm_channel_call_indicate returns, caller_data->sigmsg will be NULL.
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example #2a - Setting raw data without autofree feature:
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--------------------------------------------------------
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When using ftmod_sangoma_isdn, user wants to transmit a custom Facility IE, inside a FACILITY message.
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ftdm_caller_data_t *caller_data;
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ftdm_sigmsg_t sigmsg;
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uint8_t my_facility_ie [200];
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unsigned my_facility_ie_len = 0;
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/* Fill my_facility_ie with custom data here */
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my_facility_ie[my_facility_ie_len++] = 0x1C; /* Q.931 Facility IE ID */
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my_facility_ie[my_facility_ie_len++] = 0x03; /* Length of facility IE */
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my_facility_ie[my_facility_ie_len++] = 0x01;
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my_facility_ie[my_facility_ie_len++] = 0x02;
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my_facility_ie[my_facility_ie_len++] = 0x03;
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sigmsg.raw.data = my_facility_ie;
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sigmsg.raw.len = my_facility_ie_len;
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sigmsg.raw.autofree = 0;
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/* Attach sigmsg to channel's caller_data */
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caller_data = ftdm_channel_get_caller_data(ftdmchan);
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caller_data->sigmsg = &sigmsg;
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sigmsg.event_id = FTDM_SIGEVENT_FACILITY;
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ftdm_channel_call_send_msg(ftdmchan, sigmsg);
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example #2b - Setting raw data with autofree feature:
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-----------------------------------------------------
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ftdm_caller_data_t *caller_data;
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ftdm_sigmsg_t sigmsg;
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uint8_t *my_facility_ie = ftdm_calloc(1, 200);
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unsigned my_facility_ie_len = 0;
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/* Fill my_facility_ie with custom data here */
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my_facility_ie[my_facility_ie_len++] = 0x1C; /* Q.931 Facility IE ID */
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my_facility_ie[my_facility_ie_len++] = 0x03; /* Length of facility IE */
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my_facility_ie[my_facility_ie_len++] = 0x01;
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my_facility_ie[my_facility_ie_len++] = 0x02;
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my_facility_ie[my_facility_ie_len++] = 0x03;
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sigmsg.raw.data = my_facility_ie;
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sigmsg.raw.len = my_facility_ie_len;
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sigmsg.raw.autofree = 1;
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/* Attach sigmsg to channel's caller_data */
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caller_data = ftdm_channel_get_caller_data(ftdmchan);
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caller_data->sigmsg = &sigmsg;
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sigmsg.event_id = FTDM_SIGEVENT_FACILITY;
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ftdm_channel_call_send_msg(ftdmchan, sigmsg);
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/* FreeTDM will automatically free my_facility_ie */
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2. User application receiving variables and raw buffer from FreeTDM
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==================================================================
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example #1 - print all variables received from FreeTDM
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------------------------------------------------------
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/* Inside event call-back function */
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ftdm_iterator_t *iter = NULL;
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ftdm_iterator_t *curr = NULL;
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const char *var_name = NULL;
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const char *var_value = NULL;
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/* Read all variables attached to this event */
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iter = ftdm_event_get_var_iterator(sigmsg, iter);
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for (curr = iter ; curr; curr = ftdm_iterator_next(curr)) {
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ftdm_get_current_var(curr, &var_name, &var_value);
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fprintf("Call Variable: %s=%s\n", var_name, var_value);
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}
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ftdm_iterator_free(iter);
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example #2 - accessing a specific variable
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------------------------------------------
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/* Inside event call-back function */
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char *string = NULL;
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string = ftdm_event_get_var(sigmsg, "isdn.prog_ind.descr");
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if (string && *string) {
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fprintf("Progress indicator:%s\n", string);
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}
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example #3 - accessing raw data
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-------------------------------
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/* Inside event call-back function */
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ftdm_size_t len;
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uint8_t *mydata;
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if (ftdm_event_get_raw_data(sigmsg, (void**)&mydata, &len) == FTDM_SUCCESS) {
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/* raw data is available, do something with mydata here */
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}
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