[asterisk-dev] On ParkAndAnnounce and parking lot

[Sharath Chandra]

Thanks again, Andrew.

Things are working pretty fine. But i see a spurious errors on the console.
I use Cisco 2800 and codecs used are 711ulaw as priority on both sides. May
be i'll discuss this in another thread.

regards,
Sharath
===================================
Executing ParkedCall("SIP/192.168.50.2-088cde00", "366") in new stack
    -- Channel SIP/192.168.50.2-088cde00 connected to parked call 366
Mar 28 17:07:36 WARNING[10027]: chan_sip.c:2692 sip_write: Asked to transmit
frame type 64, while native formats is 4 (read/write = 4/4)
Mar 28 17:07:36 WARNING[10027]: chan_sip.c:2692 sip_write: Asked to transmit
frame type 64, while native formats is 4 (read/write = 4/4)
Mar 28 17:07:36 WARNING[10027]: chan_sip.c:2692 sip_write: Asked to transmit
frame type 64, while native formats is 4 (read/write = 4/4)
Mar 28 17:07:36 WARNING[10027]: chan_sip.c:2692 sip_write: Asked to transmit
frame type 64, while native formats is 4 (read/write = 4/4)
Mar 28 17:07:36 WARNING[10027]: chan_sip.c:2692 sip_write: Asked to transmit
frame type 64, while native formats is 4 (read/write = 4/4)



On 3/27/06, Andrew Kohlsmith <akohlsmith-asterisk at benshaw.com> wrote:
>
> On Monday 27 March 2006 04:45, Sharath Chandra wrote:
> > I downloaded the latest branch as on today 27th March. I tried to access
> > the 'PARKEDAT' variable in the following manner, but always the value of
> > ${PARKEDAT} is displayed blank. Actually i want to access this variable
> > when dialed on another extension.
> > Can you give me some sample dialplan showing the usage.
>
> > [default]
> (on a technical note, I'd *never* suggest actually using [default].  Put a
> matchall that does a Hangup in there and nothing else, and use specific
> contexts so you never get a call there you're not expecting.)
>
> > include => parkedcalls
>
> Your dialplan looks like a real potential rat's nest...  I'd strongly
> suggest
> separating things out and saving yourself a world of headaches in the
> (near)
> future.
>
> > exten => 4170056,1,Answer
> > exten => 4170056,2,Wait(1)
> > exten => 4170056,3,Playback(welcome)
> > exten => 4170056,4,ParkAndAnnounce(|20||default,${EXTEN},5)
>
> You're not using ParkAndAnnounce correctly at all; You're saying to come
> back
> to "default,${EXTEN},5" if the park times out, but you're not specifying
> who
> to call and tell the parking lot to, nor are you specifying a template to
> announce with. ParkAndAnnounce isn't quite the same as Park().
>
> With ParkAndAnnounce, you need to Dial() someone to "announce" the parked
> call's slot to.  This was originally intended to be played out over an
> overhead paging system, but it's far too useful to just relegate to that
> simple task.  To use the variable it's easiest to "call" the Local/
> channel
> and deal with it in there:
>
> exten => 4170056,4,ParkAndAnnounce(PARKED||Local/${EXTEN}@ParkedAt)
>
> That will "Dial" (i.e. create a call) to 4170056 in the ParkedAt context
> and
> "play" the parking lot # to that extension.  We don't care about the
> audio,
> but the variable ${PARKEDAT} will arrive there as well, and that's what
> we're
> interested in.  I've also eliminated the timeout.  So now let's use the
> variable:
>
> [ParkedAt]
> exten => _X.,1,NoOp(Call to ${EXTEN} was parked at ${PARKEDAT})
> exten => _X.,n,Goto(default,${EXTEN},5)
>
> All this does is jump back to your original context (again, don't use
> default,
> icky, icky, icky!) at the next priority, and you can take it from here:
>
> > exten => 4170056,5,NoOp(${PARKEDAT})
> > exten => 4170056,6,Playback(goodbye)
> > exten => 4170056,7,Hungup
>
> Now you're not doing much.  If you want to store it somewhere that
> something
> else (another call, perhaps) can use it, you need to put it somewhere,
> like
> in AstDB:
>
> exten => 4170056,5,Set(DB(LastParkedCall)=${PARKEDAT})
>
> Now you can use 4170057 to actually pull it and use it:
>
> exten => 4170057,1,Answer
> exten => 4170057,n,Wait(1)
> exten => 4170057,n,Set(PARKEDAT=DB(LastParkedCall))
> exten => 4170057,n,Set(DB(LastParkedCall)=)
> exten => 4170057,n,ParkedCall(${PARKEDAT})
>
> (Note that the application name is ParkedCall, not ParkedCalls.)
>
> You can see that I set the channel variable PARKEDAT here to the DB value
> I
> stored, and then I erase the DB value (actually set it to an empty value).
> If you wanted to be more robust you could check for an empty value and
> deal
> with it, or even create some kind of array storage, since every parked
> call
> will "erase" the value of the last one in the DB.
>
> Clear as mud?  :-)
>
> To Recap:  ParkAndAnnounce() parks the call, and then Dial()'s someone to
> announce where the call is, instead of announcing the parking slot to the
> other party (the one who requested the park).  It's that Dial()'d someone
> that not only gets the audio, but also gets the channel variable.
>
> Another (slightly more complete) example follows.  *74 parks the call, *75
> picks up the last parked call.  If nobody picks up the parked call within
> 20
> seconds, the *74 dialplan continues by clearing out the DB entry and
> calling
> the receptionist's phone (extension 221 in this example):
>
> [foo]
> exten => *74,1,ParkAndAnnounce(PARKED,20,Local/s at ParkedAt)
> exten => *74,n,NoOp(Call timed out, erasing Parking Slot Number since call
> isn't there anymore, it's here)
> exten => *74,n,Set(DB(LastParkedAt)=)
> exten => *74,n,NoOp(Ok, the person you've parked is back here... What are
> you
> gonna do?)
> exten => *74,n,Goto(extensions,221,1)
>
> exten => *75,1,NoOp(Going to pick up the last parked call)
> exten => *75,n,Set(PARKEDAT=DB(LastParkedAt))
> exten => *75,n,Set(DB(LastParkedAt)=)
> exten => *75,n,ParkedCall(${PARKEDAT})
>
> [ParkedAt]
> exten => s,1,NoOp(Call was parked at ${PARKEDAT})
> exten => s,n,Set(DB(LastParkedAt)=${PARKEDAT})
> exten => s,n,Hangup
>
> -A.
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