This may apply mostly to users behind corp. or personal firewall appliances (such as PIX firewall) or corp software (such as checkpoint) and computer firewalls such as FreeBSD/Linux and Windows firewall systems where the phone adapter MUST reside behind the firewall.
My Vonage line was dropping up to 50% of all incoming calls. (dead air after answering). Outbound worked fine except faxes and Visa merchant machines which were problematic even after using *99 in the dialing options.
Trouble shooting with Vonage indicated no problems, Very good ping times, extremely low latency, high bandwidth etc. Vonage could not find any issues, however the problem still persisted. I was about to cancel the service.
However troubleshooting an issue with older SMTP gateways (email servers) came across an issue that eventually fixed all the problems with Vonage.
Basically, some firewalls have documented issues ( PIX, Checkpoint, Winroute, etc.) with ESMTP commands sent to some mail gateways when the duplex on the internet interface is set to full duplex. (this was a completely unrelated issue)
This is NOT a duplex mismatch issue however and therefore troubleshooting does not indicate a problem. It is however due to the stateful packet inspection and issues they have when full duplex to the internet is enabled. This is documented in tech forums for the above mentioned firewalls.
The common fix was to set the internet interface to 10MB/Half duplex. After doing this, it not only fixed problems with ESMTP but also fixed SIP and Vonage services.
Since changing to half duplex, phone services have been perfect.
This might be worth trying for those users behind such firewalls and where the phone adapter is also behind this type of firewall.
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