--- chan_dahdi.c        2009-02-06 12:29:41.000000000 -0700
+++ chan_dahdi.c.new    2009-02-24 16:16:14.000000000 -0700
@@ -3228,6 +3228,69 @@
 }
 
 #ifdef HAVE_PRI
+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";
@@ -13688,6 +13751,9 @@
                        pthread_cancel(pris[i].master);
        }
        ast_cli_unregister_multiple(dahdi_pri_cli, ARRAY_LEN(dahdi_pri_cli));
+
+       ast_unregister_application(dahdi_send_mwi_act_facility_app);
+       ast_unregister_application(dahdi_send_mwi_deact_facility_app);
        ast_unregister_application(dahdi_send_keypad_facility_app);
 #endif
 #if defined(HAVE_SS7)
@@ -14899,6 +14965,11 @@
        }
        pri_set_error(dahdi_pri_error);
        pri_set_message(dahdi_pri_message);
+
+       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);
        ast_register_application(dahdi_send_keypad_facility_app, dahdi_send_keypad_facility_exec,
                        dahdi_send_keypad_facility_synopsis, dahdi_send_keypad_facility_descrip);
 #endif