> Can anyone please let me know is there any 
> scenario wherein it will be required that 
> Subscriber makes a call to himself?

The common example is users dialing there own number as a mechanism to
connect to their voice mail server; however I'm not sure if actually
discussed within the IMS documents.  The proxy/B2BUA recognizes the
situation and redirects/proxies the call to the voice mail server
instead of attempting to actually ring the phone making the call.

  
> is there any RFC/draft saying something regarding this?

Not sure.


> IF such scenario happen what should be the correct 
> behavior of proxy?

Act however the proxy is supposed to act concerning spirals, loop
detection, routing, and services.

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