siproxdy capabilities/configuration

Hi,

Im currently in the process of replacing the masquerading firewall at my
work. Currently this firewall has ser installed on it, and internal
office calls get routed through it to our internal pbx host. 

However, we wish to be able to make incoming and outgoing sip calls
between work and our homes. The configuration looks like this:
(hopefully the ascii comes out). The hardphones are Polycom SIP phones.

                                       ISDN
                                        |
      +---------------------+    +------+-----+   +----------+
Net---|masq firewall/siproxd|----|Software PBX|-+-|Hardphone1|
      +---------------------+    +------------+ | +----------+
                                                |
                                                | +----------+
                                                +-|Hardphone2|
                                                  +----------+

Looking at siproxd docs, it seems that normally we would configure our
hardphones to register with siproxd for incoming calls via the net. In
our case though our PBX provides functionality such as voicemail, as
well as ISDN connectivity. Is it possible to configure siproxd to proxy
any incoming sip calls to our domain through our PBX, as well as
proxying outbound sip calls over the net? 

In this scenario the phones would register with the PBX, and we hope to
be able to get sip via the net, ISDN, and also aditional PBX
functionality. Any pointers about how to set this up would be
appreciated.

Thanks,
Anthony



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