http://www.vonage.com/help.php?artic...egory=46&nav=4
Tips for Resolving
* From your Vonage account, there is a feature called the bandwidth saver. This feature controls the amount of bandwidth used for a phone call. Try adjusting the bandwidth saver to either medium or normal. After you adjust your settings, test and see if there is a difference in the audio quality. Please note that when you change bandwidth saver it could take a few minutes for the device to reboot and take the changes.
* Reboot all of your devices (Vonage device, any routers and cable / DSL modems). Read how to reboot (power cycle) your network devices.
* Ensure that your Vonage device is at least four feet away from any other device.
* Ensure your Vonage device is in a well ventilated area to keep from overheating.
* Ensure no file sharing, P2P applications, or large downloads are running while you are using the phone. These activities can use up most of your bandwidth, leaving little left for your calls.
* Connect your Vonage device directly to your cable / DSL modem, if it is not already. If this helps the audio quality, then the problem is occurring between the Vonage device and modem.
* If your Vonage device connects to another router and not directly to your cable / DSL modem, try disabling any firewalls or SPI (State full Packet Inspection) on that router. Click here to learn about firewalls and SPI.
* If you wish not to disable your firewall, then you can port forward the Vonage traffic to the adapter. Click here to learn about port forwarding.
Wireless Routers and Cordless phones – If you have a wireless router and a cordless phone:
* Ensure all wireless devices and cordless phone bases are at least four feet away from each other.
Home wiring – If you are using home wiring:
* Ensure the land line has been disconnected in the Demarc box.
* Ensure there are no more than five phones connected through the house wiring. The signal fades as more phones are connected to house wiring.
* Test with one phone directly connected to your Vonage device. If this fixes the issue, there may be a problem with your house wiring.