--- chan_dahdi.c.orig   2009-01-28 10:29:26.000000000 -0700
+++ chan_dahdi.c        2009-02-18 15:37:12.000000000 -0700
@@ -2678,6 +2678,7 @@
 
                ldp_strip = 0;
                prilocaldialplan = p->pri->localdialplan - 1;
+
                if ((l != NULL) && (prilocaldialplan == -2 || prilocaldialplan == -3)) { /* compute dynamically */
                        if (strncmp(l, p->pri->internationalprefix, strlen(p->pri->internationalprefix)) == 0) {
                                if (prilocaldialplan == -2) {
@@ -2890,6 +2891,76 @@
 }
 
 #ifdef HAVE_PRI
+static char *dahdi_send_mwi_act_facility_app = "DAHDISendMWIActFacility";
+
+static char *dahdi_send_mwi_act_facility_synopsis = "Send MWI activate via CISC";
+
+static char *dahdi_send_mwi_act_facility_descrip = 
+"       DAHDISendMWIActFacility(): This application will send an MWI Facility message over the ISDN D-channel.\n";
+
+static int dahdi_send_mwi_act_facility_exec(struct ast_channel *chan, void *data)
+{
+       /* Data will be the extension number */
+       struct dahdi_pvt *p;
+       char *digits = (char *) data;
+
+       if (ast_strlen_zero(digits)) {
+               ast_log(LOG_WARNING, "No digit string sent to application!\n");
+               return -1;
+       }
+
+       p = (struct dahdi_pvt *)chan->tech_pvt;
+
+       ast_mutex_lock(&p->lock);
+
+       if ((p->call = pri_new_call(p->pri->pri))) {
+               pri_mwi_activate(p->pri->pri, p->call, "274", PRI_UNKNOWN, "Asterisk MWI", PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN, digits, PRI_UNKNOWN); 
+               pri_rel(p->pri);
+       } else {
+               ast_debug(1, "Unable to setup new call via pri_new_call.\n");
+               return -1;
+       }
+
+       ast_mutex_unlock(&p->lock);
+
+       return 0;
+}
+
+static char *dahdi_send_mwi_deact_facility_app = "DAHDISendMWIDeactFacility";
+
+static char *dahdi_send_mwi_deact_facility_synopsis = "Send MWI deactivate via CISC";
+
+static char *dahdi_send_mwi_deact_facility_descrip =       
+"       DAHDISendMWIDeactFacility(): This application will send an MWI Facility message over the ISDN D-channel.\n";
+
+static int dahdi_send_mwi_deact_facility_exec(struct ast_channel *chan, void *data)
+{
+        /* Data will be the extension number */
+        struct dahdi_pvt *p;
+        char *digits = (char *) data;
+
+        if (ast_strlen_zero(digits)) {
+                ast_log(LOG_WARNING, "No digit string sent to application!\n");
+                return -1;
+        }
+
+        p = (struct dahdi_pvt *)chan->tech_pvt;
+
+        ast_mutex_lock(&p->lock);
+
+        if ((p->call = pri_new_call(p->pri->pri))) {    
+                pri_mwi_deactivate(p->pri->pri, p->call, "274", PRI_UNKNOWN, "Asterisk MWI", PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN, digits, PRI_UNKNOWN);
+                pri_rel(p->pri);   
+        } else {                 
+                ast_debug(1, "Unable to setup new call via pri_new_call.\n");
+                return -1;
+        }                
+
+        ast_mutex_unlock(&p->lock);
+
+        return 0;
+}
+
 static char *dahdi_send_keypad_facility_app = "DAHDISendKeypadFacility";
 
 static char *dahdi_send_keypad_facility_synopsis = "Send digits out of band over a PRI";
@@ -13550,6 +13621,8 @@
        }
        ast_cli_unregister_multiple(dahdi_pri_cli, ARRAY_LEN(dahdi_pri_cli));
        ast_unregister_application(dahdi_send_keypad_facility_app);
+       ast_unregister_application(dahdi_send_mwi_act_facility_app);
+       ast_unregister_application(dahdi_send_mwi_deact_facility_app);
 #endif
 #if defined(HAVE_SS7)
        for (i = 0; i < NUM_SPANS; i++) {
@@ -14832,6 +14905,10 @@
        pri_set_message(dahdi_pri_message);
        ast_register_application(dahdi_send_keypad_facility_app, dahdi_send_keypad_facility_exec,
                        dahdi_send_keypad_facility_synopsis, dahdi_send_keypad_facility_descrip);
+       ast_register_application(dahdi_send_mwi_act_facility_app, dahdi_send_mwi_act_facility_exec,
+                       dahdi_send_mwi_act_facility_synopsis, dahdi_send_mwi_act_facility_descrip);
+       ast_register_application(dahdi_send_mwi_deact_facility_app, dahdi_send_mwi_deact_facility_exec,
+                       dahdi_send_mwi_deact_facility_synopsis, dahdi_send_mwi_deact_facility_descrip);
 #endif
 #ifdef HAVE_SS7
        memset(linksets, 0, sizeof(linksets));