Beep when receiving a MUC invitation (by default)

data/default_config.cfg

@@ -170,7 +170,8 @@ show_inactive_tabs = true
 # - private (when a new private message is received, from your contacts or
 #            someone from a MUC)
 # - message (any message from a MUC)
-beep_on = highlight private
+# - invite (when you receive an invitation for joining a MUC)
+beep_on = highlight private invite
 
 
 # Theme

src/core.py

@@ -371,6 +371,8 @@ class Core(object):
         if password:
             msg += ". The password is \"%s\"." % password
         self.information(msg, 'Info')
+        if 'invite' in config.get('beep_on', 'invite').split():
+            curses.beep()
         self.pending_invites[jid.bare] = inviter.full
 
     def command_invite(self, arg):