VoyenceControl passes a standard telnet:// to the client. You will need to change the default association within the workstation.
From Windows File Explorer:
PuTTY:
"C:\PATH_TO_PUTTY\Putty.EXE" %1
use dde
application: PuTTY
topic: System
SecureCRT:
"C:\PATH_TO_SECURECRT\SecureCRT.EXE" %1
use dde
application: SecureCRT
topic: System
If you need to switch this back to the default, the default value is:
rundll32.exe url.dll,TelnetProtocolHandler %1