--- chan_dahdi.c.svn	2009-03-04 23:30:17.000000000 +1300
+++ chan_dahdi.c	2009-03-04 23:31:28.000000000 +1300
@@ -1064,8 +1064,10 @@ static struct dahdi_pvt {
 	int msgstate;
 #ifdef HAVE_DAHDI_LINEREVERSE_VMWI
 	struct dahdi_vmwi_info mwisend_setting;				/*!< Which VMWI methods to use */
-	unsigned int mwisend_fsk: 1;		/*! Variable for enabling FSK MWI handling in chan_dahdi */
+	unsigned int mwisend_fsk:1;		/*! Variable for enabling FSK MWI handling in chan_dahdi */
 	unsigned int mwisend_rpas:1;		/*! Variable for enabling Ring Pulse Alert before MWI FSK Spill */
+	unsigned int mwisend_lrdtas:1;		/*! Variable for enabling Line Reversal and Dual Tone Alert Signal before MWI FSK Spill */
+	unsigned int mwisend_dtas:1;		/*! Variable for enabling Dual Tone Alert Signal before MWI FSK Spill */
 #endif
 	int distinctivering;				/*!< Which distinctivering to use */
 	int cidrings;					/*!< Which ring to deliver CID on */
@@ -9451,6 +9453,8 @@ static struct dahdi_pvt *mkintf(int chan
 #ifdef HAVE_DAHDI_LINEREVERSE_VMWI
 		tmp->mwisend_setting = conf->chan.mwisend_setting;
 		tmp->mwisend_fsk  = conf->chan.mwisend_fsk;
+		tmp->mwisend_lrdtas = conf->chan.mwisend_lrdtas;
+		tmp->mwisend_dtas = conf->chan.mwisend_dtas;
 		tmp->mwisend_rpas = conf->chan.mwisend_rpas;
 #endif
 		if (chan_sig & __DAHDI_SIG_FXO) {
@@ -14812,11 +14816,26 @@ static int process_dahdi(struct dahdi_ch
 			} else {					/* Default FSK */
 				confp->chan.mwisend_fsk = 1;
 			}
-			if (strcasestr(v->value, "rpas")) { 		/* Ring Pulse Alert Signal, normally followed by FSK */
+			/* TAS: TE Alerting Signal before FSK.*/
+			/* Reference ETSI EN 300 659-1 V1.3.1 (2001-01) */
+			if (strcasestr(v->value, "lrdtas")) { 		/* LR+DT-AS: Line reversal followed by DT-AS */
+				confp->chan.mwisend_lrdtas = 1;
+				confp->chan.mwisend_dtas = 0;
+				confp->chan.mwisend_rpas = 0;
+			} else if (strcasestr(v->value, "dtas")) {	/* DT-AS: Dual Tone Alerting Signal */
+				confp->chan.mwisend_lrdtas = 0;
+				confp->chan.mwisend_dtas = 1;
+				confp->chan.mwisend_rpas = 0;
+			} else if (strcasestr(v->value, "rpas")) { 	/* RP-AS: Ring Pulse Alert Signal */
+				confp->chan.mwisend_lrdtas = 0;
+				confp->chan.mwisend_dtas = 0;
 				confp->chan.mwisend_rpas = 1;
 			} else {
+				confp->chan.mwisend_lrdtas = 0;
+				confp->chan.mwisend_dtas = 0;
 				confp->chan.mwisend_rpas = 0;
 			}
+
 			if (strcasestr(v->value, "lrev")) { 		/* Line Reversal */
 				confp->chan.mwisend_setting.vmwi_type |= DAHDI_VMWI_LREV;
 			}