I am also thinking to install IP cam. I know there are brands like Panasonic, Veo, Vivotek, etc. Which brand you use? Is it easy to install the IP cam?
I know that for security reason, most 'big' company only allow port 80 to enter (for internet web service) and block other ports (even you ask your IT colleague,they will not disclose which port is allowed). However, Netvigator did not provide port 80 for home user, but Hutchison and I-cable provide port 80. If you have friends using other ISP, you may try to install the IP cam and test in your company.