diff --git a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.c b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.c
index 22c89cb920..a7656267f2 100644
--- a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.c
+++ b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.c
@@ -56,9 +56,6 @@ static sng_isdn_event_interface_t		g_sngisdn_event_interface;
 
 ftdm_sngisdn_data_t				g_sngisdn_data;
 
-extern ftdm_status_t sng_isdn_activate_trace(ftdm_span_t *span, sngisdn_tracetype_t trace_opt);
-extern ftdm_status_t sngisdn_check_free_ids(void);
-
 ftdm_state_map_t sangoma_isdn_state_map = {
 	{
 	{
diff --git a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.h b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.h
index 953bfee85a..336ffe9538 100644
--- a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.h
+++ b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.h
@@ -273,10 +273,21 @@ FT_DECLARE(void) clear_call_glare_data(sngisdn_chan_data_t *sngisdn_info);
 
 void stack_hdr_init(Header *hdr);
 void stack_pst_init(Pst *pst);
+
 FT_DECLARE(ftdm_status_t) get_ftdmchan_by_spInstId(int16_t cc_id, uint32_t spInstId, sngisdn_chan_data_t **sngisdn_data);
 FT_DECLARE(ftdm_status_t) get_ftdmchan_by_suInstId(int16_t cc_id, uint32_t suInstId, sngisdn_chan_data_t **sngisdn_data);
 FT_DECLARE(ftdm_status_t) sng_isdn_set_avail_rate(ftdm_span_t *ftdmspan, sngisdn_avail_t avail);
 
+FT_DECLARE(ftdm_status_t) cpy_calling_num_from_stack(ftdm_caller_data_t *ftdm, CgPtyNmb *cgPtyNmb);
+FT_DECLARE(ftdm_status_t) cpy_called_num_from_stack(ftdm_caller_data_t *ftdm, CdPtyNmb *cdPtyNmb);
+FT_DECLARE(ftdm_status_t) cpy_redir_num_from_stack(ftdm_caller_data_t *ftdm, RedirNmb *redirNmb);
+FT_DECLARE(ftdm_status_t) cpy_calling_name_from_stack(ftdm_caller_data_t *ftdm, Display *display);
+
+FT_DECLARE(ftdm_status_t) cpy_calling_num_from_user(CgPtyNmb *cgPtyNmb, ftdm_caller_data_t *ftdm);
+FT_DECLARE(ftdm_status_t) cpy_called_num_from_user(CdPtyNmb *cdPtyNmb, ftdm_caller_data_t *ftdm);
+FT_DECLARE(ftdm_status_t) cpy_redir_num_from_user(RedirNmb *redirNmb, ftdm_caller_data_t *ftdm);
+FT_DECLARE(ftdm_status_t) cpy_calling_name_from_user(ConEvnt *conEvnt, ftdm_channel_t *ftdmchan);
+
 /* Outbound Call Control functions */
 void sngisdn_snd_setup(ftdm_channel_t *ftdmchan);
 void sngisdn_snd_setup_ack(ftdm_channel_t *ftdmchan);
@@ -331,6 +342,14 @@ void sngisdn_process_rst_ind (sngisdn_event_data_t *sngisdn_event);
 
 void sngisdn_rcv_phy_ind(SuId suId, Reason reason);
 void sngisdn_rcv_q921_ind(BdMngmt *status);
+
+void sngisdn_trace_q921(char* str, uint8_t* data, uint32_t data_len);
+void sngisdn_trace_q931(char* str, uint8_t* data, uint32_t data_len);
+void get_memory_info(void);
+
+ftdm_status_t sng_isdn_activate_trace(ftdm_span_t *span, sngisdn_tracetype_t trace_opt);
+ftdm_status_t sngisdn_check_free_ids(void);
+
 void sngisdn_rcv_q921_trace(BdMngmt *trc, Buffer *mBuf);
 void sngisdn_rcv_q931_ind(InMngmt *status);
 void sngisdn_rcv_q931_trace(InMngmt *trc, Buffer *mBuf);
diff --git a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_hndl.c b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_hndl.c
index 83a8faa465..8408c673ef 100644
--- a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_hndl.c
+++ b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_hndl.c
@@ -34,11 +34,6 @@
 
 #include "ftmod_sangoma_isdn.h"
 
-extern ftdm_status_t cpy_calling_num_from_stack(ftdm_caller_data_t *ftdm, CgPtyNmb *cgPtyNmb);
-extern ftdm_status_t cpy_called_num_from_stack(ftdm_caller_data_t *ftdm, CdPtyNmb *cdPtyNmb);
-extern ftdm_status_t cpy_redir_num_from_stack(ftdm_caller_data_t *ftdm, RedirNmb *redirNmb);
-extern ftdm_status_t cpy_calling_name_from_stack(ftdm_caller_data_t *ftdm, Display *display);
-
 /* Remote side transmit a SETUP */
 void sngisdn_process_con_ind (sngisdn_event_data_t *sngisdn_event)
 {
diff --git a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_out.c b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_out.c
index 8367687aec..124cd965b4 100644
--- a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_out.c
+++ b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_out.c
@@ -34,10 +34,6 @@
 
 #include "ftmod_sangoma_isdn.h"
 
-extern ftdm_status_t cpy_calling_num_from_user(CgPtyNmb *cgPtyNmb, ftdm_caller_data_t *ftdm);
-extern ftdm_status_t cpy_called_num_from_user(CdPtyNmb *cdPtyNmb, ftdm_caller_data_t *ftdm);
-extern ftdm_status_t cpy_calling_name_from_user(ConEvnt *conEvnt, ftdm_channel_t *ftdmchan);
-
 void sngisdn_snd_setup(ftdm_channel_t *ftdmchan);
 void sngisdn_snd_proceed(ftdm_channel_t *ftdmchan);
 void sngisdn_snd_progress(ftdm_channel_t *ftdmchan);
diff --git a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_rcv.c b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_rcv.c
index 5580f3a950..7c375f7c64 100644
--- a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_rcv.c
+++ b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_rcv.c
@@ -34,10 +34,6 @@
 
 #include "ftmod_sangoma_isdn.h"
 
-extern void sngisdn_trace_q921(char* str, uint8_t* data, uint32_t data_len);
-extern void sngisdn_trace_q931(char* str, uint8_t* data, uint32_t data_len);
-extern void get_memory_info(void);
-
 #define MAX_DECODE_STR_LEN 2000
 
 
diff --git a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_support.c b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_support.c
index aa34279813..e8e27687b4 100644
--- a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_support.c
+++ b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_support.c
@@ -34,16 +34,6 @@
 
 #include "ftmod_sangoma_isdn.h"
 
-ftdm_status_t cpy_calling_num_from_stack(ftdm_caller_data_t *ftdm, CgPtyNmb *cgPtyNmb);
-ftdm_status_t cpy_called_num_from_stack(ftdm_caller_data_t *ftdm, CdPtyNmb *cdPtyNmb);
-ftdm_status_t cpy_redir_num_from_stack(ftdm_caller_data_t *ftdm, RedirNmb *redirNmb);
-ftdm_status_t cpy_calling_name_from_stack(ftdm_caller_data_t *ftdm, Display *display);
-
-ftdm_status_t cpy_calling_num_from_user(CgPtyNmb *cgPtyNmb, ftdm_caller_data_t *ftdm);
-ftdm_status_t cpy_called_num_from_user(CdPtyNmb *cdPtyNmb, ftdm_caller_data_t *ftdm);
-ftdm_status_t cpy_redir_num_from_user(RedirNmb *redirNmb, ftdm_caller_data_t *ftdm);
-ftdm_status_t cpy_calling_name_from_user(ConEvnt *conEvnt, ftdm_channel_t *ftdmchan);
-
 ftdm_status_t sngisdn_check_free_ids(void);
 
 extern ftdm_sngisdn_data_t	g_sngisdn_data;
@@ -157,7 +147,7 @@ ftdm_status_t sng_isdn_set_avail_rate(ftdm_span_t *span, sngisdn_avail_t avail)
 	return FTDM_SUCCESS;
 }
 
-ftdm_status_t cpy_calling_num_from_stack(ftdm_caller_data_t *ftdm, CgPtyNmb *cgPtyNmb)
+FT_DECLARE(ftdm_status_t) cpy_calling_num_from_stack(ftdm_caller_data_t *ftdm, CgPtyNmb *cgPtyNmb)
 {
 	if (cgPtyNmb->eh.pres != PRSNT_NODEF) {
 		return FTDM_FAIL;
@@ -184,7 +174,7 @@ ftdm_status_t cpy_calling_num_from_stack(ftdm_caller_data_t *ftdm, CgPtyNmb *cgP
 	return FTDM_SUCCESS;
 }
 
-ftdm_status_t cpy_called_num_from_stack(ftdm_caller_data_t *ftdm, CdPtyNmb *cdPtyNmb)
+FT_DECLARE(ftdm_status_t) cpy_called_num_from_stack(ftdm_caller_data_t *ftdm, CdPtyNmb *cdPtyNmb)
 {
 	if (cdPtyNmb->eh.pres != PRSNT_NODEF) {
 		return FTDM_FAIL;
@@ -206,7 +196,7 @@ ftdm_status_t cpy_called_num_from_stack(ftdm_caller_data_t *ftdm, CdPtyNmb *cdPt
 	return FTDM_SUCCESS;
 }
 
-ftdm_status_t cpy_redir_num_from_stack(ftdm_caller_data_t *ftdm, RedirNmb *redirNmb)
+FT_DECLARE(ftdm_status_t) cpy_redir_num_from_stack(ftdm_caller_data_t *ftdm, RedirNmb *redirNmb)
 {
 	if (redirNmb->eh.pres != PRSNT_NODEF) {
 		return FTDM_FAIL;
@@ -226,7 +216,7 @@ ftdm_status_t cpy_redir_num_from_stack(ftdm_caller_data_t *ftdm, RedirNmb *redir
 	return FTDM_SUCCESS;
 }
 
-ftdm_status_t cpy_calling_name_from_stack(ftdm_caller_data_t *ftdm, Display *display)
+FT_DECLARE(ftdm_status_t) cpy_calling_name_from_stack(ftdm_caller_data_t *ftdm, Display *display)
 {
 	if (display->eh.pres != PRSNT_NODEF) {
 		return FTDM_FAIL;
@@ -239,7 +229,7 @@ ftdm_status_t cpy_calling_name_from_stack(ftdm_caller_data_t *ftdm, Display *dis
 	return FTDM_SUCCESS;
 }
 
-ftdm_status_t cpy_calling_num_from_user(CgPtyNmb *cgPtyNmb, ftdm_caller_data_t *ftdm)
+FT_DECLARE(ftdm_status_t) cpy_calling_num_from_user(CgPtyNmb *cgPtyNmb, ftdm_caller_data_t *ftdm)
 {
 	uint8_t len = strlen(ftdm->cid_num.digits);
 	if (!len) {
@@ -267,7 +257,7 @@ ftdm_status_t cpy_calling_num_from_user(CgPtyNmb *cgPtyNmb, ftdm_caller_data_t *
 	return FTDM_SUCCESS;
 }
 
-ftdm_status_t cpy_called_num_from_user(CdPtyNmb *cdPtyNmb, ftdm_caller_data_t *ftdm)
+FT_DECLARE(ftdm_status_t) cpy_called_num_from_user(CdPtyNmb *cdPtyNmb, ftdm_caller_data_t *ftdm)
 {
 	uint8_t len = strlen(ftdm->dnis.digits);
 	if (!len) {
@@ -297,7 +287,7 @@ ftdm_status_t cpy_called_num_from_user(CdPtyNmb *cdPtyNmb, ftdm_caller_data_t *f
     return FTDM_SUCCESS;
 }
 
-ftdm_status_t cpy_redir_num_from_user(RedirNmb *redirNmb, ftdm_caller_data_t *ftdm)
+FT_DECLARE(ftdm_status_t) cpy_redir_num_from_user(RedirNmb *redirNmb, ftdm_caller_data_t *ftdm)
 {
 	uint8_t len = strlen(ftdm->rdnis.digits);
 	if (!len) {
@@ -329,7 +319,7 @@ ftdm_status_t cpy_redir_num_from_user(RedirNmb *redirNmb, ftdm_caller_data_t *ft
 }
 
 
-ftdm_status_t cpy_calling_name_from_user(ConEvnt *conEvnt, ftdm_channel_t *ftdmchan)
+FT_DECLARE(ftdm_status_t) cpy_calling_name_from_user(ConEvnt *conEvnt, ftdm_channel_t *ftdmchan)
 {
 	uint8_t len;
 	ftdm_caller_data_t *ftdm = &ftdmchan->caller_data;