asterisk users - Nov 2008 - Howto grab back call transfered from SIP phone

Once in a while, someone mis-dials when transfering a call on their Snom
SIP phone (using the Transfer button).

Instead of sending them to, say, 1940; they mistype and enter 194 or 190
or somesuch.  This ends up on the PSTN (for which three digit calls are
valid); not what anyone wanted.

On our old PBX (Network Alchemy Argent Office) there was a dialcode that
grabbed back the last call that went through your extension - very
useful when you realised what you'd done.

Is there any way of programming this in Asterisk?  I've googled to no
avail :-(

-- 
 Regards,
     Russell
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| Russell Brown          | MAIL: russell at lls.com PHONE: 01780 471800 |
| Lady Lodge Systems     | WWW Work: http://www.lls.com              |
| Peterborough, England  | WWW Play: http://www.ruffle.me.uk         |
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> On our old PBX (Network Alchemy Argent Office) there was a dialcode that
> grabbed back the last call that went through your extension - very
> useful when you realised what you'd done.
We tend to train our customers to always use attended transfer rather than blind
transfer. Seems to solve the problem nicely.

If that's not an option, how about writing a transfer macro that'll
return the call to the originating extension if the transfer is unanswered
within X seconds?

Regards,

Chris