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Title: router and NAT must be disabled to work with Vonage
Review: The Motorola SBG900 is notorious for its incompatibility with Vonage, the Voice-over-Internet-protocol (VOIP) telephony provider. Vonage devices simply do not work reliably with this device if the router and network-address-translation firewall are enabled. Mine came from the internet service provider (ISP) so I had no choice in the matter -- it was the cable modem the ISP insisted on issuing -- so I had to negotiate with the ISP to cripple the firewall and router functions. Once that was done, it began to function as a simple cable modem and allowed me to connect my own router, which supports Vonage. Thus, if you are interested in using Vonage or a similar VOIP service, avoid the Motorola SBG900.
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