Agent Desktop Plus · advanced · 12 min full read
A desktop review is short: one screen, WSS through the proxy, TLS 1.2, the schedule visible, text not blocked, USB headset, supported path, Efficiency Mode off, and the bandwidth rows added up. Each line is from the product page or the PDF.
If those pass and audio is still one-way, you are in NAT and firewall territory, which is the SIP track. The desktop is no longer the prime suspect.