HD Voice — What Is It and How Do I Use It?

Overview

HD Voice (also known as "Wideband Audio") is an audio standard that delivers significantly better call quality compared to traditional telephony. While standard phone calls only transmit a narrow frequency range of 300–3,400 Hz, HD Voice uses an extended range of 50–7,000 Hz. The result: voices sound more natural, background noise is better suppressed, and conversations are clearer and more comfortable overall.

What does HD Voice actually do?

The difference between standard telephony and HD Voice is immediately noticeable:

• More natural voices — The extended frequency range reproduces voices more realistically. Sibilants like "s" and "f", which often sound unclear in traditional telephony, become clearly distinguishable.
• Better intelligibility — Fewer requests to repeat and fewer misunderstandings, especially with names, numbers, and technical terms.
• Less fatigue — People who spend a lot of time on the phone notice the difference: HD Voice is less tiring for the ear, which is particularly relevant in call centers and during long conferences.
• Better noise cancellation — Modern HD Voice codecs filter out background noise more effectively.

Requirements for HD Voice

HD Voice only works when the entire connection chain supports the standard. This means:

1. IP phone or headset with HD Voice support — Most modern IP phones (e.g., Yealink T4x/T5x series, snom D series, Gigaset) support HD Voice. For headsets, look for the "Wideband" designation in the technical specifications.
2. Cloud PBX with HD codec — Your Virtual-Call Cloud PBX supports the HD codecs G.722 and Opus. These are enabled by default.
3. Sufficient internet connection — HD Voice requires slightly more bandwidth than standard telephony (approx. 80 kbps instead of 64 kbps per call). This is not an issue with modern internet connections.
4. The other party must also support HD Voice — If an HD-capable phone calls a device without HD Voice, it automatically falls back to standard quality.

Using HD Voice with Virtual-Call

With Virtual-Call, HD Voice is enabled by default — no configuration needed. As long as both call participants use HD-capable devices and the connection runs through the Virtual-Call network, HD Voice is used automatically.

How to check if HD Voice is active

• Yealink phones — During a call, a small "HD" icon is displayed on the screen.
• Virtual-Call UC Client — The client uses the Opus codec by default, which supports HD Voice and more.
• Listening test — The simplest test: call another HD-capable extension in your organization. If both sides are HD-capable, you'll hear the difference immediately.

Tips for optimal voice quality

• Check codec priority — Make sure G.722 or Opus is set as the preferred codec on your IP phone (this is automatic for Virtual-Call provisioned devices).
• Prefer wired connections — Connect your IP phone via Ethernet, not Wi-Fi. This reduces packet loss and latency fluctuations.
• Enable QoS — If your router supports Quality of Service (QoS), prioritize voice traffic. See our Network Optimization for VoIP article for details.
• Use a good headset — A quality headset with wideband support makes more of a difference than many people think. Check our Headset Recommendations for guidance.

Frequently asked questions

Does HD Voice cost extra?
No. HD Voice is included with Virtual-Call at no additional cost.

Does HD Voice work for external calls?
That depends on whether the other party's provider also supports HD Voice. Within the Virtual-Call network and for internal calls, HD Voice is always available. For external calls to landline or mobile networks, quality depends on the respective carrier.

Does HD Voice use more data?
Slightly more (about 20% compared to standard codecs). This is negligible on a normal internet connection.