Site-to-Site VPN no working by using Symantec SGS-360R VPN Router

Dear Experts:
   I am  new to VPN and it is a little urgent.  I have an Symantec SGS-360R VPN router.  I need to setup a Site-to-Site VPN connection to my headquarter which also use Symantec VPN Router.  We have no Server installed here and have 8 computers need internet connection .  The setup are:

      (1). Use Motorola DSL Modem from at&t with static IP range from xx.xx.82.33 ~ xx.xx.82.37.
      (2). Gateway ---- xx.xx.82.38
      (3). Modem is setup to use PPPoE
      (4). LAN IP of SGS-360R is 192.168.1.1 and Netmask is 255.25.255.0.   DHCP is enable
      (5). WAN connection type is PPPoE
      (6). Static IP & DNS under WAN/ISP are
                    IP Address ---------- xx.xx.82.33
                    NetMask  ------------ 255.255.255.248
                    Default gateway --- xx.xx.82.38

 We can use SGS-360R to connect to internet now. I can ping XX.XX.82.38 and got reply. But the headquarter can not get VPN connection.

    I notice that on Status of Logging/Monitoring in SGS-360R the WAN port looks like the following.  The IP address is different.

                  Connecion Status :  Connected
                  IP Address            :  xx.xx.82.38  (not xx.x.82.33)
                  Default gateway   :  xx.xx.82.38
                  DNS IP address     : 68.94.156.1
                  Netmask                : 255.255.255.0

My questions are:
  (1). Why the IP under WAN/ISP is different from IP under   Logging/Monitoring
  (2). more setup suggestions or info.
  (3). How to test the VPN Connection

I hope this is clear enough to know my situation. Can anyone help?  Thanks.