If a Teams VDI user sees "Azure Virtual Desktop Media Optimized" or "Citrix HDX Optimized" instead of SlimCore, they are on the legacy WebRTC stack, and error codes 2000 (No Plugin) and 2003 (Virtual Channel not allowed) are the most likely causes.
Checked 2026-10-02
- Vendor
- Microsoft
- Product
- Microsoft Teams
- Subsystem
- VDI 2.0 SlimCore optimization
- Deployment
- vdi
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Troubleshooting the VDI 2.0 solution for Teams — Microsoft · tier 2 current vendor documentation · Introductory bullet 'Not optimized with SlimCore and instead you see: Azure Virtual Desktop Media Optimized / Citrix HDX Optimized'
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting softphones in Citrix and VMware virtual desktops: source note vdi-softphone-troubleshooting-teams-legacy-webrtc-strings. WarmTransfer. https://warmtransfer.net/knowledge/claims/vdi-softphone-troubleshooting-teams-legacy-webrtc-strings
BibTeX
@misc{warmtransfer-claim-vdi-softphone-troubleshooting-teams-legacy-webrtc-strings,
title = {Troubleshooting softphones in Citrix and VMware virtual desktops: source note vdi-softphone-troubleshooting-teams-legacy-webrtc-strings},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/vdi-softphone-troubleshooting-teams-legacy-webrtc-strings},
note = {Source note vdi-softphone-troubleshooting-teams-legacy-webrtc-strings, checked 2026-10-02}
}