[VOIPSEC] Virus/Worms/Trojan attack against VoIP

[Gupta, Sachin]

Hi,
 
Is anybody aware of the possibility of virus attack on a Resedential
Gateway / IP Phone, running of a well known Operating system, with Voice
capabilities ?
This kind of attack can even remove or change the digital certificates .
Soft phones may not fall in this category as they run on PCs which may
have antivirus installed.
 
Is this a theoritical attack or anything like this has happened before?
 
 
Sachin