freetdm: Initial attempt to bridge natively SS7 signaling between 2 channels

libs/freetdm/src/include/private/ftdm_core.h

@@ -130,6 +130,9 @@
 extern "C" {
 #endif
 
+#define SPAN_PENDING_CHANS_QUEUE_SIZE 1000
+#define SPAN_PENDING_SIGNALS_QUEUE_SIZE 1000
+
 #define GOTO_STATUS(label,st) status = st; goto label ;
 
 #define ftdm_copy_string(x,y,z) strncpy(x, y, z - 1) 
@@ -686,6 +689,9 @@ FT_DECLARE(ftdm_status_t) ftdm_sigmsg_remove_var(ftdm_sigmsg_t *sigmsg, const ch
  */
 FT_DECLARE(ftdm_status_t) ftdm_sigmsg_set_raw_data(ftdm_sigmsg_t *sigmsg, void *data, ftdm_size_t datalen);
 
+/*! \brief Retrieve a span and channel data structure from a string in the format 'span_id:chan_id'*/
+FT_DECLARE(ftdm_status_t) ftdm_get_channel_from_string(const char *string_id, ftdm_span_t **out_span, ftdm_channel_t **out_channel);
+
 /*!
   \brief Assert condition
 */

libs/freetdm/src/include/private/ftdm_types.h

@@ -265,6 +265,8 @@ typedef enum {
 #define FTDM_CHANNEL_BLOCKING        (1ULL << 35)
 /*!< Media is digital */
 #define FTDM_CHANNEL_DIGITAL_MEDIA   (1ULL << 36)
+/*!< Native signaling bridge is enabled */
+#define FTDM_CHANNEL_NATIVE_SIGBRIDGE (1ULL << 37)
 
 #include "ftdm_state.h"