This is the data structure that contains text identifiers for a trunk, and each of the lines on the trunk.
typedef struct {
char trunk_id[SL_TRUNK_ID_SIZE] ;
char line_id[SL_MAX_CHANNELS_PER_TRUNK][SL_LINE_ID_SIZE] ;
} SL_TRUNK_ID_ST, * SL_TRUNK_ID_SP ;
typedef SL_TRUNK_ID_ST * PSL_TRUNK_ID_ST ;