Re: Difference between Address.addCallObserver and Terminal.addCallObserver

Stephan,

Observers (or listeners) in JTAPI can be interested in events from a
_different perspective_:
- A call, regardless of where the call occurs. (Call.addCallObserver)
- Calls on a given address.
- Calls on a given terminal (e.g, a telephone set)
(Terminal.addCallObserver)

Regardless of where you register for the events, JTAPI guarantees that
you will receive only one event.  An implementation does something like
this (pseudo):

U = Union;

Given a Call c, a Terminal t and an Address a:

// Union of all observers
Observers = c.observers U t.observers U a.observers

// Eliminate duplicates.
Observers.EliminateDuplicates()


-----Original Message-----
From: Discussion list for Java Telephony API
[mailto:[email protected]] On Behalf Of Stephan Steiner
Sent: Thursday, February 09, 2006 8:18 AM
To: [email protected]
Subject: [JTAPI] Difference between Address.addCallObserver and
Terminal.addCallObserver

Hi

I don't quite get the difference and the JTAPI documentation is rather
vague on this subject. I suppose if we have one terminal with exactly
one address, I can make a call to either one and the result is the same.

However, what if the Terminal has multiple Addresses? Would going over
each Address of the Terminal and registering a CallObserver result in
the same as one call to Terminal.addCallObserver?

And since I'm using the Cisco JTAPI provider it gets even better: We can
actually have an existing Terminal to which an Address is added, or
removed while a JTAPI application is running. Does anybody know if in
case I have added a CallObserver to my Terminal, and now an Address is
added to it or removed from it.. if I will get the CallEvs for the new
Address or if I will have to register a CallObserver on each new Address
(and consequently also remove the CallObserver from each Address that is
taken away from the device). This actually isn't a rare case when
Extension Mobility is used..
Terminals can get new Addresses added or removed all the time during an
Extension Mobility login / logout.

I'd appreciate any input you can give on this subject.

Regards
Stephan

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