Index: chan_phone.c
===================================================================
--- chan_phone.c	(révision 37764)
+++ chan_phone.c	(copie de travail)
@@ -127,8 +127,9 @@
    
 #define MODE_DIALTONE 	1
 #define MODE_IMMEDIATE	2
-#define MODE_FXO		3
+#define MODE_FXO	3
 #define MODE_FXS        4
+#define MODE_SIGMA      5
 
 static struct phone_pvt {
 	int fd;							/* Raw file descriptor for this device */
@@ -902,7 +903,7 @@
 	phonee.bytes = ioctl(i->fd, PHONE_EXCEPTION);
 	if (phonee.bits.dtmf_ready)  {
 		digit[0] = ioctl(i->fd, PHONE_GET_DTMF_ASCII);
-		if (i->mode == MODE_DIALTONE || i->mode == MODE_FXS) {
+		if (i->mode == MODE_DIALTONE || i->mode == MODE_FXS || i->mode == MODE_SIGMA) {
 			ioctl(i->fd, PHONE_PLAY_STOP);
 			ioctl(i->fd, PHONE_REC_STOP);
 			ioctl(i->fd, PHONE_CPT_STOP);
@@ -954,6 +955,17 @@
 				ioctl(i->fd, PHONE_PLAY_CODEC, ULAW);
 				ioctl(i->fd, PHONE_PLAY_START);
 				i->lastformat = -1;
+			} 
+			else if (i->mode == MODE_SIGMA) {
+			  ast_mutex_lock(&usecnt_lock);
+			  usecnt++;
+			  ast_mutex_unlock(&usecnt_lock);
+			  ast_update_use_count();
+			  /* Reset the extension */
+			  i->ext[0] = '\0';
+			  /* Play the dialtone */
+			  i->dialtone++;
+			  ioctl(i->fd,PHONE_DIALTONE);
 			}
 		} else {
 			if (i->dialtone) {
@@ -1019,7 +1031,7 @@
 				FD_SET(i->fd, &efds);
 				if (i->fd > n)
 					n = i->fd;
-				if (i->dialtone) {
+				if (i->dialtone && i->mode != MODE_SIGMA) {
 					/* Remember we're going to have to come back and play
 					   more dialtones */
 					if (ast_tvzero(tv)) {
@@ -1037,7 +1049,7 @@
 		ast_mutex_unlock(&iflock);
 
 		/* Wait indefinitely for something to happen */
-		if (dotone) {
+		if (dotone && i->mode != MODE_SIGMA) {
 			/* If we're ready to recycle the time, set it to 30 ms */
 			tonepos += 240;
 			if (tonepos >= sizeof(DialTone))
@@ -1353,6 +1365,8 @@
 		} else if (!strcasecmp(v->name, "mode")) {
 			if (!strncasecmp(v->value, "di", 2)) 
 				mode = MODE_DIALTONE;
+			else if (!strncasecmp(v->value, "sig", 3))
+				mode = MODE_SIGMA;
 			else if (!strncasecmp(v->value, "im", 2))
 				mode = MODE_IMMEDIATE;
 			else if (!strncasecmp(v->value, "fxs", 3)) {