first of all NEVER POST YOUR EMAIL ADDRESS IN FORUMS UNLESS YOU WANT TO GET LOTS OF SPAM MAIL.take a look here to get a basic idea about port forwarding.settings maybe a little differnt for your modem but basic principles are same for all modems.
http://www.indiabroadband.net/bsnl-b...sl2_141-a.html (configuring port forwarding & accessing advanced options in SIEMENS SL2_141)