Wingate + VoIP router + ADSL modem

[dimao]

Hi,
We have Wingate PC directly connected to ADSL modem.
Now we want to put VoIP router(Patton SN2300), between WG PC and modem. This router does NAT/PAT. Will this solution work? Which changes we should do in WG conf if yes? We use NAT on WG as well but most of requests service by WG services.
Also we have some servers in LAN, which must be reachable from outside(FTP, mail)