IMPORTANT

Audio over EDT Lossy (loss tolerant mode for audio) is currently in tech preview, and currently supported on Windows and Linux directly and with Gateway Service.

Audio over EDT Lossy increases the user experience for real-time audio streaming and improves audio quality compared to audio over EDT or TCP when users are connecting through networks with high latency and packet loss.
 

System requirements

Following are the minimum versions required to use Audio over EDT Lossy:

• Citrix Virtual Delivery Agent (VDA) 2311 (download)
• Citrix Workspace app for Windows 2311 (download)

1. Configure the Adaptive Transport Policy

1. By default, adaptive transport is enabled (Preferred), and EDT is used when possible, with fallback to TCP.  You can change its setting as needed:
   • Preferred. Adaptive transport over EDT is used when possible, with fallback to TCP.
   • Diagnostic mode.  EDT is forced on and fallback to TCP is disabled.  We recommend this setting only for troubleshooting.
   • Off.  TCP is forced on, and EDT is disabled.

2. Configure Audio over EDT Lossy and Disable Audio over UDP

1. Disable the "Audio over UDP real-time transport" if enabled. Audio over UDP should be disabled in order for Loss tolerant mode for audio to execute; otherwise, Audio over UDP will take priority.
2. By default, "Loss tolerant mode for audio" is disabled (Prohibited). You can change the setting as needed:
   
   • Allowed. Enables audio over EDT Lossy.
   • Prohibited. Disables audio over EDT Lossy.

3. Reference Registry Keys

Single Session (Desktop) VDA

1. Navigate to [HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\Audio]
2. <DWORD> value "EdtUnreliableAllowed" is 1 when enabled and 0 when disabled

Multi-session (Server) VDA

1. Navigate to [HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432NODE\Citrix\Audio]
2. <DWORD> value "EdtUnreliableAllowed" is 1 when enabled and 0 when disabled

Client Machine

1. Navigate to [HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Citrix\ICAClient\Engine\Configuration\Advanced\Modules\ClientAudio]
2. <String> value "EdtUnreliableAllowed" and set the value to 1 when enabled and 0 when disabled

 

• Optionally, for remote connections, Citrix Gateway Service is required for more info see documentation.

Troubleshooting

To verify that EDT Lossy has been configured correctly, you can use either of the following tools:

Citrix Audio Diagnostic Tool
Go to Audio Session > Session Info > Basic Info and verify that <Data Transport>  is set to EDT-Unreliable


Alternatively, you can use the Audio diagnostic command line tool
Open a command prompt, and type the following:  ctxaudio

Settings Information will confirm if Audio over EDT Lossy is enabled EdtUnreliableAllowed should be set to <True>

State information will confirm that Audio over EDT Lossy is being used in the session Data Transport should be <EDT Unreliable>

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