FXO and FXS devices.  Or ARD (automatic ring down)  If you don’t need high 
speed you might get a SIP ATA to work.  
You could use T1 channel banks at each end.  One end configured FXO  and the 
other FXS and then use a T1 over IP or T1 over ethernet to connect the two.  
That would work up to probably 28.8 kbps or maybe even 33.6.  56K requires the 
modems to suss out the T1 timing.  It could work I suppose if the T1 timing was 
very very very jitter free.  That would depend on the pseudowire type of device 
you would  use to adapt to ethernet.   
I don’t think you need dial tone but you do need need line voltage on one end 
and ring voltage on the other.  I don’t remember the Hayes AT codes like I used 
to but I think you can force a connect without dialing.  
From: TJ Trout 
Sent: Saturday, February 07, 2015 2:58 AM
To: [email protected] 
Subject: [AFMUG] Modem over ethernet ?

Does such a thing exist ? I need to take two devices that use modems to 
communicate and make them talk over ethernet? Like a box that makes the modem 
think it has dial tone, then establishes a virtual phone connection to another 
box that rings the far device ? Does that make since ? 

Can't modify the existing system/modems, just want to eliminate the phone line 
and communicate over ethernet...

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