[asterisk-users] Discover Asterisk 1.4 :: SIP Subscriptions

[Tilghman Lesher]

On Tuesday 15 January 2008 16:03:16 Andrea Spadaccini wrote:
> Russell wrote:
> > Andrea wrote:
> > > I have a small question: other than a phone (ie. SIP/something), what
> > > else can I use as "app"? Can I handle the change via some custom code?
> >
> > There are a number of things that can provide "device state" in Asterisk.
> > That includes "real" devices such as SIP endpoints, or any other channel
> > driver. However, it also includes things like monitoring the state of a
> > space in parking, or the usage of a MeetMe conference.  I have also
> > written a small dialplan function which lets you create custom device
> > states.  A lot of people use this for things like having a light on the
> > phone that reflects whether the agent is logged in or not.
> >
> > More information:
> >
> > http://asterisk.org/node/48325
> > http://asterisk.org/node/48360
>
> Thanks a lot for the info, I already read the first article, and it's great
> to know that DEVSTATE can be used in 1.4.
>
> But my question was different, my poor english doesn't help me. :(
>
> In your article I read
> "For example, when someone subscribes to the state of extension
>  1234, Asterisk knows to give them the state of the SIP phone SIP/myphone.
>
>  exten => 1234,hint,SIP/myphone"
>
> Suppose that I want to write to a database the state of all my extensions,
> in order to display it in a web page.
>
> How could I do it using the hint mechanism?

Just create a module that subscribes to every single device and when the state
changes, your callback will get an event with the device name that changed.
You could then update your database with an SQL query (or whatever else you
like).

-- 
Tilghman