Re: [Asterisk-java-users] originateCall in AsteriskManager

[Tony M. <to...@am...>]

I meant to say "I do not know what the ideal callback mechanism would =
look
like for me ..."


-----Original Message-----
From: ast...@li...
[mailto:ast...@li...] On Behalf Of =
Tony
Mowers
Sent: Thursday, June 01, 2006 12:39 PM
To: ast...@li...
Subject: Re: [Asterisk-java-users] originateCall in AsteriskManager


The asynchronous origination would work for me.  I am listening for =
channel
state changes so it means most things in my particular application are
asynchronous.

I know what the ideal mechanism would look like for me, so I'll just =
talk
aloud about some of my thoughts.

I would like to be able to register for callbacks before any events are
generated for my call.  I don't want to miss any events related to my =
call.
If that can be done by automatically registering my property change =
listener
to the originating channel immediately then that would be good.

I don't know enough about Asterisk to know whether watching the property
changes of the originating channel is equivalent to watching a phone =
call.
I know that intuitively I would like to watch the call.

The types of things I'd like to watch for are:
- Originating channel was created (I didn't screw up with channel data)
- Origination information was incorrect and call ended
- Originating channel was congested and so call aborted
- Alerting is happening on originating channel=20
- Origination alerting timed out
- Originator has answered
- Another channel has been linked to call
- A channel in the call is being alerted
- A channel in the call has answered
- One of the channels has hung-up or failed
- Call has ended

I have to admit that the logical object model for asterisk is not very =
clear
to me yet.  My basic understanding of it is that an originating channel =
gets
created and then some application is applied to the channel either in =
the
form of an extension or directly as an application.  The application can =
do
certain things to the channel, such as creating another channel and =
linking
it to the originating channel.  That's my na=EFve understanding of the =
logical
model.

I don't know if this sheds any light on what might be the typical user
requirements.


-----Original Message-----
From: ast...@li...
[mailto:ast...@li...] On Behalf Of
Stefan Reuter
Sent: Thursday, June 01, 2006 12:03 AM
To: ast...@li...
Subject: Re: [Asterisk-java-users] originateCall in AsteriskManager

Hi Tony,

these are two very good questions :)
What I thought of was to make to call to originate asynchronous so that
you could pass it some kind of callback (maybe just a property change
listener) that is called on changes to the originated channel.
What do you think?

=3DStefan

Tony Mowers wrote:
> Stefan,
>=20
> =20
>=20
> I=92ve been playing a little bit with the AsteriskManager interface.  =
In
> my application I have encountered two difficulties:
>=20
> =20
>=20
> 1)       I have a race condition right after originating the call.  I
> originate the call, receive the new AsteriskChannel, and then register =
a
> property change listener with it. I have no way of knowing if the
> channel state has changed after origination but before having =
registered
> the listener.  I can probably synchronize on the channel and get a =
safe
> result, but it feels a bit awkward.
>=20
> 2)       There is no way for me to determine the reason for the call
> failure when the originate returns null.  For example if any of the
> origination parameters, such as an illegal channel, caused the =
failure.
>=20
> =20
>=20
> My application code that wraps the AsteriskManager has an interface
> somewhat like a JTapi API.
>=20
> =20
>=20
> Call call =3D pbxService.createCall(=85);
>=20
>             call.addObserver(myObserver());
>=20
>             call.connect();
>=20
> =20
>=20
> Does anybody have suggestions for how to deal with (1) and (2)?


--=20
reuter network consulting
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Germany
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