
VoIP is almost never encripted
Why when we have a secure standard for voice calls, and almost everything is moving/has moved to VoIP are we still using RTP rather than SRTP for almost all phone lines?
Just watch the data stream with WireShark, select VoIP and listen to the call.
It is the same with phone hacking - someone hacks your account makes lots of call to numbers that are only there to make money, and come the morning your provider gives you a bill for £1,000 because they "have to payfor the onward leg", when it's clearly a fraudulent set of calls.
End user securty in the telecoms world does exist, & could be implimented today. Yet it's not done.