It appears that the Vonage VoIP telephone adapter comes with an embedded login of user with a password of user.
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Vonage VoIP Telephone Adapter Default Misconfiguration
The Vonage VoIP Telephone Adapter device is, by default, accessible from the WLAN/internet. The product ships with the default username of 'user' and default password of 'user' to access the administrative backend.
Users are suggested to update their passwords immediately. An attacker could cause a denial-of-service by uploading broken firmware to the device, or by constantly rebooting the device.
John Martinelli
john@martinelli.com
http://RedLevel.org
RedLevel.org Security