Telephony File Conversion
Telephony File Conversion


How do I find
out what format
my client needs?


Have questions?



Available Formats:
CCITT .wav
Dialogic mu-Law .vox
Dialogic a-law .vox
Dialogic ADPCM .vox
InterVoice .ivc
Natural Microsystems
...and many more!

If you do not see the  format  you need listed here,
Email us!
We're sure we can provide it!

How do I find out
what format
my client needs?

There are many different telephony computer systems and many different telephony file formats out there.

And if you don’t provide the right file format for your client’s system it’ll sound like the snow on an old TV set.

Just like there are different types of
.wav files (mono, stereo, 48K, 44.1K, 16bit, 24bit….) and different types of .
mp3 files (128K, 256, 96K…) there are different types of telephony audio files.

Now, don’t panic!

You cannot, and you SHOULD not have to guess as to the correct format the client needs.

It is the client’s responsibility to tell you what they need.

So what do you do?

When a client says he needs a telephony file format you need to ask 3 questions:

  1. What’s the format or sound family?
  2. What’s the bit depth/sound type?
  3. What’s the sampling rate?

If they don’t know the answer, you tell them that they can find that information in one of the following ways:

  • by contacting their vendor,
  • by contacting their IT person or
  • by actually looking at the instruction book that came with the system!
Again, unless you know (and tell us) right file type, it just won’t play.

So,  let’s say a client says: “I need a .vox file?”

What’s the format or Sound family?
The format is “.vox” – 9 times out of 10 that will be a Dialogic .vox file so you can at least pretty much go with that assumption.

What’s the bit depth/sound type?
Is it ADPCM or Mu-Law (also pronounced simply “U-Law” – comes from the Greek)
ADPCM is always 4bit. Mu-Law is always 8bit

What’s the sampling rate?
6000 Hz (6K), 8000 Hz (8K)? Another rate?

With Dialogic for example the 2 most common are:
4bit 6K ADPCM and 8bit 8K Mu-Law

But the bottom line is that with so many formats out there, you can never assume anything.

Just ask your client, and then tell us.