I don't know of any ATA like that except the grandstream.

The service provider grade way to do this would probably be a Cisco (or 
similar) with a T1 interface and a channel bank to break the T1 into 24 
FXS ports.



> Hi,
>
> I'm looking for an 8+ FXS ATA gateway (at least 8 ports but preferably at 
> most 24 ports) with 2 ethernet interfaces for network/switch redundancy.
>
> So far I've only found the Grandstream GXW4008.
>
> I've searched similar brands such as Linksys and higher-end brands such as 
> Quintum, but they all seem to have just one NIC. So, if the switch the ATA is 
> connected to fails then I'm out of business (at least until I replace the 
> switch but that's usually too long for a busy system).
>
> The GXW4008 device is very useful for this scenario. It has 2 RJ45 ports 
> (called WAN and LAN) and I've set them up in two local subnets. Not only does 
> the ATA keep working without human intervention if one of the switches goes 
> down but if both switches are up it can load balance between the two (simply 
> by using DNS SRV with the same weights).
>
> Unfortunately, Grandstream in general doesn't seem to be very reliable 
> although the latest GXW4008 firmware has proven to be quite stable in my case 
> (previous releases were buggy).
>
> So I'm looking for alternatives to the GXW4008, even if it has to cost me 
> more money. Does anyone know of an 8+ FXS ATA brand/model with 2 ethernet 
> interfaces?
>
> Thanks in advance.
>
> Vieri
>
>
>
>       
>
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