How to enable /disable MWI ?

Question

Hi,
I want to write a small application to enable/disable IP Phone lamp. But confused by how to enable MWI(Message Waiting indicator). TAPI ? AXL ? or some others , which can implement it . Could you give me some direction, thank you !

Answer 1

I never checked what happens on a database level. However, for any actions that have a direct influence on a device, writing directly into the database is the wrong approach.
As an example: if you set a forward (callforward all) via database (and not AXL), calls may well be forwarded, but the phone's status won't be adapted (so you don't have the callforward indicator and no information about the callforward). If you set the callforward via JTAPI or AXL, the phone's status will also be updated to show that it has been forwarded.
When you configure a phone, you'll see the same thing in many cases.. especially in older CCM releases, you were often told that you need to reset the phone to apply a change you've made. In newer versions, this is often (but not always done automatically.. you'll see the phone restart after pressing update).. it's the same thing here.. you write into the database, but then you also have to apply those changes to the phone (one good example is changing a line label.. you won't get the label to change on the phone by just writing to the database.. you have to restart the phone for it to load the new label name).
Even if you need to get the mwi status, JTAPI will do that for you (CiscoAddress.getMessageWaiting - and to set it, it's CiscoAddress.setMessageWaiting). Since you need a CTI command to set the MWI, you can as well resort to CTI to get the MWI status as well and don't bother with the database.
fkcallingsearchspace_mwi is definitely not it though - I can tell you that without looking at the diagram since fk_anything is a foreign key and you have an uuid value in that field. The mwi status would be a boolean since it can have just two values. In fact, it's numplan.ismessagewaitingon but as I said.. with any element that has a direct influence on a phone's appearance or behavior, you cannot just change it... at best you need a phone reset. And if you do it with JTAPI (and probably TAPI too.. I can't be sure because I've never done TAPI and hope to never have to), you can change the MWI status on the fly without having to restart the phone, which is much more elegant.