Hi,
I'm not sure what you are trying to achieve and please do not take this as a product recommendation, but I have used a ZYXEL Prestige 2000L with Voxalot for the last couple of years.
It allows 2 SIP registrations, mapping to to 2 phones, PSTN to 1 phone. It works out of the box, simple to configure and has been pretty bomb proof.
IT WILL NOT do some the clever things the Cisco boxes will do i.e gateways, dial plans, advanced config options etc.
I have 1 permanent registration with Voxalot, the other I use to check provider voice quality, etc before adding to to Voxalot "Providers". PSTN in maps through the box so I don't have multiple phones on my desk.
It's not perfect but it works.
Hope this helps
Best regards
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