No Audio / One-Way Audio

"One-way audio" means you can hear the other person but they can't hear you, or vice versa. This is a common and usually fixable VoIP issue.

Check the basics first

Make sure you haven't accidentally left the call muted.
On Desktop, check the correct microphone and speaker are selected as your system's default input/output devices (in your operating system's sound settings, not inside the app itself — DT Desktop Direct uses whatever your OS has set as default).
If you're using a USB or Bluetooth headset, make sure it's actually connected and selected as the default device before the call starts — plugging it in mid-call may not be picked up until you restart the app.

Network causes

One-way or no audio is very often a network/firewall issue rather than an app problem — something is blocking the audio stream in one direction while the call signalling (which controls setup/teardown) still gets through fine. This is common on:

Restrictive corporate/guest Wi-Fi networks
Some VPNs
Certain routers with aggressive firewall or "SIP ALG" settings

If this only happens on one specific network (e.g. at one office location, or one particular Wi-Fi), that's a strong sign the network itself is the cause — try a different network (like mobile data) to confirm.

Still not working?

Contact your administrator with:

Whether it's no audio in both directions, or just one direction
What network you were on when it happened
What device/platform you're using

Audio-path issues often need server-side traces to fully diagnose, so this detail helps a lot.