PC and VOIP with 2 routers

I apologize that I've only got a little information here, but hopefully some generic advice will help... and maybe I'm missing something obvious...

We've got a new Dell All-in-One computer that only has one CAT5 port.  We have an AT&T VOIP system that has its own router.  The question is:  how can we attach our LAN/internet cable from the wall (our LAN router) AND the VOIP cable from the VOIP phone into this computer?

A switch?  Think I'll need crossover cable(s)?
K AAsked:
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Gregory MillerGeneral ManagerCommented:
If you only have a single port and more than a single device you will need a switch. The only other option might be if the phone has two Ethernet ports on it, usually they work as a bridge or mini switch just for this reason. If the phone has only one port, the the switch option is all you can do. No crossover cable is needed with a switch.

I guess there is one other option, you could run a second cable.

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K AAuthor Commented:
Thanks for your prompt reply...

A second cable?  From where to where?  (Maybe I neglected to mention that the VOIP phone needs to connect to the PC for the pop-up notifications about incoming calls, etc.
Gregory MillerGeneral ManagerCommented:
Do you have this working on other workstations or is this the first/only one?
The reason I ask is that it is not typical to have multiple interfaces in a workstation to passthrough to a phone. If this is working on another workstation, then there is much more depth to the question that may be needed.
K AAuthor Commented:
Thank you... I know it's been a while... maybe more information soon.
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