According to the LiveKit docs, Telnyx is currently the only SIP trunking provider listed as supporting HD Voice/G.722 with LiveKit SIP. However, the Telnyx setup page also says HD Voice is supported for US customers.
Does that limitation still apply? Specifically, can EU-based businesses place or receive LiveKit SIP calls using HD Voice/G.722, either through Telnyx, LiveKit Phone Numbers, or another supported provider?
Source: https://docs.livekit.io/telephony/start/providers/telnyx/#hd-voice
Quick context: HD voice means wideband audio.
G.722samples at16 kHzwith audible bandwidth up to~7 kHz, versusG.711 PSTN's 8 kHz / ~3.4 kHz. That’s why HD calls sound less tinny: consonants and sibilants survive the codec instead of getting filtered out at telephone-narrowband.
For EU specifically, LK’s docs don’t currently have a G.722 path.
The Telnyx page restricts HD voice to “customers in the US” [Create and configure Telnyx SIP trunk | LiveKit Documentation],
LK Phone Numbers supports HD voice “out-of-the-box” but is “Available only in the US” [LiveKit Phone Numbers | LiveKit Documentation], and
the HD voice features page says Telnyx is the only listed SIP provider with HD voice support [HD voice for SIP | LiveKit Documentation],
so Twilio, Plivo, Wavix, and Sinch don’t appear.
The G.722 config itself lives on Telnyx’s portal (enable HD voice per DID + enable G.722 codec on the trunk), not LK’s SBC, so the US restriction is upstream at Telnyx. Fastest verification is asking your Telnyx account team whether their EU SIP trunks can actually negotiate G.722 in practice. If they can, you’re done. If they confirm it’s a Telnyx-side regional limit, that’s a feature gap to file in livekit/sip.
