I would agree with Brian. That's a huge range to open. It really does not matter what port the CLEC uses - it's what port the CLEC is trying to access on the ATA on our (customer) side and only those ports need to be forwarded. For one provider to hog a range that wide is (in my opinion) unreasonable. Surely you can work with your partners that they use a certain range for VOIPo customers? As I previously mentioned: my basic understanding is that there is a port/ports on the CLEC side and a port/ports on the customer side that talk to each other and while the CLEC gateway could be talking to many many customers and so will need a wide range of ports in operation on the CLEC side, they can still target a narrow range on the customer side.
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