You should consult your VoIP provider, or the manual if the device came with one. Also make sure that it is not actually the router blocking your connection. Can your VoIP box go behind the router, or does it have to connect directly to your modem?
One option might be to get a switch\hub (NOT a router) and connect it to your modem. Connect the VoIP box to one port and the router to the other. This will only work however if your ISP gives you multiple IP addresses.
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With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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