potentsg

Hi expert,
I would like to know whether the Echolife HG520s can pass through IPSec packets (UDP 500)?
Have already found and tested the port forwarding website but wan't able to make VPN connection:
http://portforward.com/english/routers/port_forwarding/Huawei/EchoLife-HG520s/Echolink.htm
Search the manufacturer website and look like this model does not support port fordwarding:
http://forum.huawei.com/jive4/thread.jspa?threadID=320885&tstart=100&orderStr=8
Are there anyone have the same problem? Any idea appreicate! Thank you.