Spoof caller IDs, mask your voice
Mon Jan 30 14:34:48 2006 EST (-0500 GMT)The caller ID system allows advanced users to change their ID number to any number they want. This is so people calling from companies, etc. can have their caller ID appear as the main company phone number, not the outgoing line the internal phone system choose.
This has allowed hackers to spoof caller ID calls for a while. Now it’s an online service that even includes voice masking: SpoofCard.com.
Try it out (you have to pay). This site will let you play pranks on your friends our issue threats to foreign leaders — I don’t recommend the latter.