HD Voice

HD Voice (also called wideband audio) uses advanced codecs that capture a much wider range of audio frequencies than traditional phone calls. Standard phone calls use the narrowband G.711 codec, which transmits frequencies between 300 Hz and 3,400 Hz. HD Voice codecs like G.722 and Opus capture 50 Hz to 7,000 Hz or wider.

The result: voices sound natural and lifelike, background noise is reduced, and every word comes through clearly. It's the difference between AM radio and FM radio.

HD Voice calls require slightly more bandwidth than narrowband calls, but the requirements are modest:

• G.722: ~90 kbps per call (including overhead)
• Opus: ~30–128 kbps depending on configuration
• G.711: ~90 kbps per call

Any modern broadband connection supports HD Voice easily. For the best experience, we recommend:

• At least 100 kbps upload/download per simultaneous call
• Latency under 150 ms
• QoS (Quality of Service) enabled on your router to prioritize VoIP traffic

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

• Clarity: Voices sound natural, not "phone-like." Consonants like S, F, and TH are easy to distinguish
• Less fatigue: Clearer audio means less strain during long calls — critical for call centers and sales teams
• Better conferencing: HD Voice is especially impactful on conference calls where multiple voices overlap
• Reduced "what did you say?": Fewer misunderstandings means shorter, more productive calls