On this page, you will find more information about the most common causes and most relevant solutions for the Lifesize error '3'. Do you need help straight away? Visit our support page.
The Lifesize documentation indicates that error code '3' is caused by the following problem: "The encryption signature is invalid. This typically occurs if the image is corrupt or compromised.".
Do you think there is another cause for this error? Let others know in the comments.