asterisk users - Sep 2009 - Dynamically Move caller to different dial plan

Hello all
Is it possible for Asterisk (it can be Asterisk Manager) to

A caller who is flowing in any dail plan (Say Dialplan A) ...On a particular
event ( can be generated by any other caller) pick him up to any other dial
plan(say Dial plan B) without his(/her) wish. ...... and after taking some
input (in Dial plan B ). Return the caller back to place where s/he was (ie
dial plan A)


For Example

A caller is in test_abc and an event occurs (any event it is not known when
it occurs). We pick the caller from test_abc dial plan and put it to
test_123.

extensions.conf

[test_abc]
exten => s,1,Answer();
exten => s,n, playback(tt-monkeys)
exten => s,n, playback(song1)
.
.
.
.

[test_123]
exten=> s,1,Answer();
exten => s,n,Playback(123);   SO ON


/// how to return back ??how to know from where he come ???




-- 
Best Regards
Shakeel Abbas
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