chlog: freetdm: ISDN - Support for chan-id-invert-extend-bit

libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.h

@@ -324,6 +324,11 @@ typedef struct ftdm_sngisdn_data {
 	uint8_t	num_dchan;
 	sngisdn_dchan_data_t dchans[MAX_L1_LINKS+1];
 	sngisdn_span_data_t *spans[MAX_L1_LINKS+1]; /* spans are indexed by link_id */
+
+#ifdef SANGOMA_ISDN_CHAN_ID_INVERT_BIT
+	/* Since this is a global configuration, place it here instead of sngisdn_span_data_t */
+	uint8_t chan_id_invert_extend_bit;
+#endif
 }ftdm_sngisdn_data_t;
 
 typedef struct ftdm2trillium

libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_cfg.c

@@ -393,6 +393,12 @@ ftdm_status_t ftmod_isdn_parse_cfg(ftdm_conf_parameter_t *ftdm_parameters, ftdm_
 			if (parse_early_media(val, span) != FTDM_SUCCESS) {
 				return FTDM_FAIL;
 			}
+		} else if (!strcasecmp(var, "chan-id-invert-extend-bit")) {
+#ifdef SANGOMA_ISDN_CHAN_ID_INVERT_BIT
+			parse_yesno(var, val, &g_sngisdn_data.chan_id_invert_extend_bit);
+#else
+			ftdm_log(FTDM_LOG_WARNING, "chan-id-invert-extend-bit is not supported in your version of libsng_isdn\n");
+#endif
 		} else {
 			ftdm_log(FTDM_LOG_WARNING, "Ignoring unknown parameter %s\n", ftdm_parameters[paramindex].var);
 		}

libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_cfg.c

@@ -720,6 +720,16 @@ ftdm_status_t sngisdn_stack_cfg_q931_dlsap(ftdm_span_t *span)
 	}
 	
 	cfg.t.cfg.s.inDLSAP.useSubAdr = 0;       /* call routing on subaddress */
+#ifdef SANGOMA_ISDN_CHAN_ID_INVERT_BIT
+	if (signal_data->switchtype == SNGISDN_SWITCH_DMS100 &&
+		g_sngisdn_data.chan_id_invert_extend_bit == SNGISDN_OPT_TRUE) {
+		/* Since this feature is not standard, we modified Trillium to check 
+		the useSubAdr field and remove the extended bit if this is set, this
+		is a global configuration and once set, applies to all spans configured
+		as DMS 100 */
+		cfg.t.cfg.s.inDLSAP.useSubAdr = PRSNT_NODEF;
+	}
+#endif
 	cfg.t.cfg.s.inDLSAP.adrPref = 0;         /* use of prefix for international calls */
 	cfg.t.cfg.s.inDLSAP.nmbPrefDig = 0;      /* number of digits used for prefix */
 	for (i = 0; i < IN_MAXPREFDIG; i++)