Hi and welcome to Voipuser
Just took a look at this device and it seems to be one of many similar gateway products now coming on to the market.
As far as I can see it is not designed to connect to multiple SIP providers but it does have multiple FXS Ports to interface to PSTN equipment at the 'user end'.
It would be possible to connect to multiple accounts using a service like Voxalot or one of the other similar providers who offer a simple PBX service. You can also set outbound calls to route via different providers depending on the prefix entered but that is not so straight forward.
I would suggest you did a bit more research as you may find you don't need a device of this complexity - a more straight forward (cheaper) ATA device connected via Voxalot could achieve the same solution.
This response was based on info from these locations ...
http://www.3cx.com/voip-gateways/audiocodes-mp.html
http://www.audiocodes.com/objects/30010 ... P-124D.pdf