I have a 2 MB .wav or .mp3 file that I want to use as a voicemail greeting on a CallPilot release 4.0 system. Our IT dept is demanding that I provide the file in .vbk format. Have so far failed to find software that can do the conversion, at least not that I am able to download without an Avaya account. Please advise if there are any converters out there on the Internet, or if someone has a moment to convert the file for me?