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Component Based Gateways

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This is a new project, which we are going to develope a new technology
in telecommunication (GSM).
My task is develope a component based gateways , then this gateway is use
for communication between two servers like HLR and IM-HSS(Extension of HSS).
In telecommunication the central data base for all subscriber data stored
in Home Location Registry(HLR), during circuit switched domain and
packet swiched domain.
But we are going to develope a new server called Home Subscriber server
(HSS), because this server will be develope totally based on web services.
and we are completely concentrate on packet switched domain because
it supports Internet and other gateways like GPRS, UMTS etc.
My task is have to develope component based Gateway between
HLR and IM-HSS (Extension of HSS) for communication between two servers .
later this gateway could be serve as web services to IM-HSS.
1. I have to develope gateway using Java beans, and for web services
2. I need a Application server
3. J2SE
4. DataBase.
My questions
1. What exactls Gateway means, for my understanding Gateway means, develope
programming logic to communicate with another just like Adapter.
But to develope gateway I need application server also??
what the softwares I need to use for develope gateway?
2. How can I develope gateways using Java beans between this two servers
for communication , plese give any simple hint to get clear.
3. Gateway between these two servers means, only java beans logic have to
develope or I need a application server also for gateways?
4. Java beans means EJB or what is the difference between these two?
5. For webservices I need a application server??
6. Where exactls fit application server between HLR and IM-HSS??
7. Once I developed gateways then this could be used for webservices
, what is structure behind gateways and web services??
7. what is the difference between J2SE and jdk1.4 and J2EE SDK??
I am bit of confusing this versions.
This would be very grateful and appriciated to clear those for me.

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