Placing an alert call from MIDlet or server

Hi All:
I am working on a project where I need to alert the user of the MIDlet by placing a voice call automatically.
Say, user of MIDlet A sends files to user of MIDlet B through our server using http protocol.
As you very welll know, the IP address of a phone is not known to our server unless the MIDlet makes the http connection by itself.
Therefore, we need to worry about some way of alerting the user of MIDlet B about the file that is waiting for him at our server which he can pick by launching his MIDlet and opening http connection.
One possibility I am suspecting could have value is placing 'missed call' alert.
I am kind of stomped on this one and appreciate any pointers on how to solve this.
SMS is not an option.
regards,
Sambo

I am working on a project where I need to alert the
user of the MIDlet by placing a voice call
automatically.
Is making a voice call part of your project or just a possible way of solution you are thinking(by missed call)????
Say, user of MIDlet A sends files to user of MIDlet B
through our server using http protocol.
You can just set a flag on your server and design client midlet to check respective flag on regular interval n take the actions. This should be the best n easy solution to notify users. With these approach even large number of clients can be served quickly (within limited resources) as compared to (resources) making voice call(missed call).
Please let me know your views on this....
thanks & regards :)

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