asterisk users - Jun 2007 - Bypass local dialplan and redirect INVITE

Hi,

I think this maybe impossible, but still want to try.
If an INVITE with different host go throught my Asterisk, I want it not look
into local dialplan and forward the request.
Some of you may suggest I use real sip proxy, but I need a stateful proxy
doing this signal proxess.

Incoming                                 Asterisk or
whatever                def.com         abc.com
    |       INVITE(44491 at def.com)
|                                       |                   |
    |------------------------------------------------|
INVITE             |                  |
    |
|-------------------------------------->|                  |
    |                                                |   301 (Call
forwarding         |                  |
                                                     |           to
abc.com)
     |                  |

|<--------------------------------------|                  |

|                        INVITE                         |

|--------------------------------------------------------->|

a regular stateless SIP proxy will forward this 301 all the way back to
incoming, which I don't want to.
Asterisk will treat first INVITE as local dial plan, even it's not in local
domain. Still cann't satisfied me.
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