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Knowledge Base

How to modify the VDI’s virtual channel priority

Publication Date:  2012-11-16  |   Views:  344  |   Downloads:  0  |   Author:  c00230043  |   Document ID:  EKB1000019687


Issue Description

When we dealing with the problem about voice quality, printer and some other external devices at site, we need to adjust the voice or printer channel with a high priority, how to adjust this kind of virtual channel’s priority?

Alarm Information


Handling Process

1. XD4, use a tool to export the XML configuration file, modify the original configuration file, and then import it, and finally actualize to modify the priority.
2. XD5, modify the register to actualize priority’s modification.
3. If we need to adjust the voice channel’s priority, modify the “CTXCAM” parameter’s priority level as “0”.

To see the detail operation method, please refer to the attachment.

Root Cause



Instruction of the virtual channel's parameters:
Channel Name                  Description
CTXCAM                              Client audio mapping
CTXTWI                                Seamless Windows screen update data (ThinWire)
CTXCTL                               Citrix Control Virtual Channel
CTXEUEM                            End User Experience Monitoring
CTXFLASH                          Citrix Flash Redirection
CTXGUSB                            USB Redirection
CTXSBR                               No longer used.
                                               Previously: Citrix Browser Acceleration
CTXSCRD                           Smartcard
CTXCLIP                              Clipboard
CTXLIC                                 License management
CTXPN                                  Program Neighborhood
CTXTW                                 Remote Windows screen update data (ThinWire)
CTXVFM                               Video server video (not ThinWire video)
CTXCCM                              Client COM port mapping
CTXCDM                              Client drive mapping
CTXMM                                 Citrix Windows Multimedia Redirection
CTXCM                                 Client management (Auto Client Update)
CTXCOM1                            Printer mapping for non-spooling client (Thin client devices)
CTXCOM2                            Printer mapping for non-spooling client (Thin client devices)
CTXCPM                               Printer mapping for spooling clients
CTXLPT1                              Printer mapping for non-spooling client (Thin client devices)
CTXLPT2                              Printer mapping for non-spooling client (Thin client devices)
OEMOEM                              Used by Original Equipment Manufacturers (OEMs)
OEMOEM2                            Used by Original Equipment Manufacturers (OEMs)