I am using WNR 2000 cable router and Grandstream 486 and 502 ATA's for provision of Sipgate VOIP. I am getting cut off and speech transmission problems, although necessary port forwarding has been carried out. Notice WNR2000 has no ` DISABLE SIP ALG ' option that always solve any previous problems on earlier routers
I am having the same problem with this model the only workareound i know is to rever t to the initial realease of the firmware to fix it. Once i reverted to the first relese my voip device worked flawlessly. try that adn see what happens if you still having the problemNetgear routers are natorious for voip problems unfortunately.