You need to first create an audio file in a compatible format (PCM, Mono, 8kHz, 16Bit).

• You can do this by using the free tool like Audacity:
  https://www.fosshub.com/Audacity.html/audacity-win-2.2.2.exe

Step-by-step guide

1. Open an existing audio file (wav, mp3, etc)
2. Convert Stereo to Mono (if applicable): Tracks →Mix → Mix Stereo Track to Mono
   
   
   
3. Tracks -> Resample -> 8000 Hz
   
   
   
   
4. Effect -> Volume and Compression → Normalize -> Remove DC offset -> Apply
   
   
   
   
5. File -> Export -> Export Audio -> Save as type: 'Other uncompressed files', Then click on ‘options’ Header: Raw (header-less), Encoding U-Law -> Save
   
   
   
   
6. Rename output file from [xyz].raw to [xyz].g711
   
7. 

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Now we need to load the audio file into the camera

1. Using the WEB GUI->Configuration->Service->Maintenance-> Configuration upload.
   Note that not always the progress will be shown but upload will happen.
   
   
   
   

2. The audio file can be played using the RCP+ command CONF_AUDIO_OUTPUT (0x09b9), payload=4 (Sample), which can of course also be sent to the device itself using ATSL scripting.

3. A trigger can be any alarm or event:
   In web browser:
   Play the Audio file: 

   https://<IPaddress>/rcp.xml?command=0x09b9&type=T_DWORD&protocol=TCP&direction=WRITE&num=1&payload=4

   Stop the Audio playback:

   https://<IPaddress>/rcp.xml?command=0x09b9&type=T_DWORD&protocol=TCP&direction=WRITE&num=1&payload=0

   
   
   

4. In the Alarm task Editor of the IP Camera Copy the below ATSL script:
   

   //{{audio_begin // Create 2 RCP commands, one to Play the file and one to stop playing the Audio RcpCommand playAudio := { Command("rcp.xml?command=0x09b9&type=T_DWORD&protocol=TCP&direction=WRITE&num=1&payload=4") }; RcpCommand stopAudio := { Command("rcp.xml?command=0x09b9&type=T_DWORD&protocol=TCP&direction=WRITE&num=1&payload=0") }; // E.g. For easy testing simply use the relay to trigger, but can just as easily be connected to IVA, Alarm Input etc. if(Relay(1)) then playAudio else stopAudio; //}}audio_end

   If there is no sound coming out of the camera then check in the audio settings for the output volume and always press ‘set’