feat(calls): Adding missed call event triggering.

resources/prosody-plugins/ext_events.lib.lua

 -- invite will perform the trigger for external call invites.
 -- This trigger is left unimplemented. The implementation is expected
 -- to be specific to the deployment.
-local function invite(stanza, url)
-   module:log(
-	  "warn",
-	  "A module has been configured that triggers external events."
-   )
-   module:log("warn", "Implement this lib to trigger external events.")
+local function invite(stanza, url, call_id)
+    module:log(
+        "warn",
+        "A module has been configured that triggers external events."
+    )
+    module:log("warn", "Implement this lib to trigger external events.")
 end
 
 -- cancel will perform the trigger for external call cancellation.
 -- This trigger is left unimplemented. The implementation is expected
 -- to be specific to the deployment.
-local function cancel(stanza, url, reason)
-   module:log(
-	  "warn",
-	  "A module has been configured that triggers external events."
-   )
-   module:log("warn", "Implement this lib to trigger external events.")
+local function cancel(stanza, url, reason, call_id)
+    module:log(
+        "warn",
+        "A module has been configured that triggers external events."
+    )
+    module:log("warn", "Implement this lib to trigger external events.")
+end
+
+-- missed will perform the trigger for external call missed notification.
+-- This trigger is left unimplemented. The implementation is expected
+-- to be specific to the deployment.
+local function missed(stanza, call_id)
+    module:log(
+        "warn",
+        "A module has been configured that triggers external events."
+    )
+    module:log("warn", "Implement this lib to trigger external events.")
 end
 
 
 local ext_events = {
-   invite = invite,
-   cancel = cancel
+    missed = missed,
+    invite = invite,
+    cancel = cancel
 }
 
 return ext_events

resources/prosody-plugins/mod_muc_call.lua

 local busy_status      = "busy"
 local rejected_status  = "rejected"
 local connected_status = "connected"
-
-
+local expired_status   = "expired"
 
 -- url_from_room_jid will determine the url for a conference
 -- provided a room jid. It is required that muc domain mapping
             return
         end
 
+        local missed = function()
+            cancel()
+            ext_events.missed(event.stanza, call_id)
+        end
+
         -- All other call flow actions will require a status.
         if event.stanza:get_child_text("status") == nil then
             return
             case = {
                 [calling_status]   = function() invite() end,
                 [busy_status]      = function() cancel() end,
-                [rejected_status]  = function() cancel() end,
+                [rejected_status]  = function() missed() end,
+                [expired_status]   = function() missed() end,
                 [connected_status] = function() cancel() end
             }
             if case[status] then case[status]() end