asterisk users - Feb 2004 - Asterisk as proxy?

Hi,

So it's like this. I've had siproxd working for me on an external host
to
which I've established a tunnel (my SIP client is behind a NAT gateway).

Of course, I've "got" to have mailbox functionality at the very
least, so a
friend of mine told me about Asterisk, which I grabbed from the CVS and
installed.

However, I've got myself somewhat confused. Do I still tell my SIP client
(SJPhone for the time being) to use siproxd as the proxy, or can/should
Asterisk be a "local" (forwarding?) proxy on the NAT side of the
tunnel?

Basically, the network looks roughly like this, if it helps any:


                 +---------+
                 | siproxd |----+
                 +---------+    |
                     #          |
                     |          |
                     T     (Internet)
                     U          |
                     N          |
                     N      +--------+
                     E      | NAT-GW | 
                     L      +--------+
                     |          |
                     #      +--------+ 
                     #######| VPN-GW |
                            +--------+
            +---------+         |         +----------+ 
            | SJPhone |---------+---------| Asterisk |      
            +---------+                   +----------+ 

Hope someone can help.

Tor