I have a two VLAN in CISCO 3750 VLAN 501, VLAN 502.I have a hosted SIP-PBX in internet.I have a NAT on two VLANS and one public white IP on cisco 1841 router.501 - for PCs and not for VoIP. 192.168.0.1/255.255.255.128 with Windows 2008 DHCP.502 - onl...