Cisco Unity Connection or UCCX – Audio File Format

Cisco Unity Connection or UCCX Audio File Format

I am pretty much sure that most of you are working on Cisco Unity Connection (CUC) or Cisco Unified Contact Center Express (UCCX) where you get a requirement to record and upload the greeting into an audio file format so that when anyone dials into the board line number, they hear the recording message.

Few examples below-

You are asked to record a greeting like “Welcome to The Collab Guru. Press 1 for English, Press 2 for the local language”.


“Today we are closed for XYZ occassion. Please call us tomorrow during business hours. Thank You”.


“You have reached us outside business hours. We operate Monday to Friday from 8:00 AM to 6:00 PM. Please call us during our business hours”.

Such greetings can be recorded using any online or offline applications or using mobile phones. But Cisco Unity Connection or Cisco Unified Contact Center Express understands the recording in a particular format only. If you upload the greetings in any other format apart from the one it understands, your greetings will not be played or uploaded.

What greeting/recording format does CUC or UCCX understands?

The answer is “CCITT u-Law” and Attributes “8.000 khz, 8 Bit, Mono“.

Here is the appropriate information:

Property Value
Bit Rate 64kbps
Audio Sample Size 8 bit
Channels 1 (mono)
Audio Sample Rate 8khz
Audio Format CCITT U-law

How do you check the format of the greeting you have recorded?

There are many ways to check the format of the greetings that you have recorded i.e., online and offline method. There are many freeware and shareware tools available over the web to check the media information, an example would be “MediaInfo – MediaArea“. In our post, we are going to check media information using VLC Player

  • If you are using VLC media player in your PC, just open the audio file using VLC media player.


  • Go to Tools >
  • Click on Codec Information >
  • Click on Codec tab >


  • Here you could see the audio file properties and verify if this is as per the requirement or do we need to convert the file according to the requirement.

How to convert the recordings to the format we need?

There are many tools available in the web which does conversion of the bit rates. Some of them are freeware and some of them are shareware. In our tutorial, we would use Audacity tool to convert the audio file into the format we need.

  • Download and Install Audacity (if not already installed)
  • Launch Audacity tool>
  • Click on File > Click on Open >
  • Select the Audio File (recorded media) and Click on Open
  • Click on File> Click on Export >
  • Click on Save as Type drop down menu and select Other uncompressed files >
  • Click on Header drop down menu and select WAV (Microsoft) >
  • Click on Encoding drop down menu and select U-LAW >
  • Click on Save



You are done! Alternatively you can use any other available tools like Wavepad or similar to it which can convert the audio properties to the one we need.

If you are looking for online web based free tools which converts text to speech, you can use the following tools for your personal and professional use:

Text to Speech Free –

iText2Speech –

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