VOIP as Gateway

[<rginski () co pinellas fl us>]

I have read the particulars to VOIP and securing 
VOIP as an application. However, has anyone 
performed any pen testing or research on using VOIP 
as a gateway? 

For example, someone from the outside (not part of 
the VOIP network) dialing from home (etc) to an 
organization's VOIP-enabled phone. Then, using the 
VOIP-enabled phone as a gateway to the rest of the 
IP network? 

TIA

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