I have a need to connect 2 business routers to one T1 circuit. The current router, which provides internet access to my network, is a Cisco 1721 series. We are migrating to an MCI VOIP solution, and an MCI tech needs to ping the new router, a Siemens SE5940. Needless to say the tech is very hard to reach, and all I've been able to squeeze out of him is that the routers "need to be in parallel." I'm not even sure what the IP address of the new router is, but I don't think I need to know it. All I know is that somehow I need to provide ping access to the new Siemens router, while keeping access to the Cisco router. Can this be done with a hub? I know that a switch will not work.