[X4U] airport express and voip

[Mitchell Senft]

I have a wireless network consisting of an Apple Airport Express  
wireless base station. Connected to it is a cable modem and a printer

Now I want to add a VOIP box but setting up this expanded network is  
beyond me.

Simplest, I would think, is if there is some sort of Ethernet cable Y- 
shaped splitter: one end goes from the cable modem and forks so one  
wire can go into the VOIP box, one into the Airport Express.

But if that’s not possible, I assume I have to replace the AE. If so,  
what are my options? I know the wireless cards had to be Apple  
proprietary cards. But does that apple to the base station? Is a  
cheap “generic” base station (wireless router”) possible with the  
Mac? Or is Vonage VOIP service simply not Mac-compatible?

Thanks,

     Mitchell