Thanks — I’m sorry you’re experiencing low voice volume on SIP calls. I’d like to help get this fixed. First I want to clarify a couple quick things so I can give the right steps. Could you tell me which of these best describes the problem? • The agent’s voice (TTS or agent microphone) sounds too quiet to the SIP participant or in-call recording (outgoing from your side)? • The SIP caller’s voice sounds too quiet to the agent or to others in the LiveKit room (incoming to your side)? • Both directions are quiet? Also please share any of the following that apply: • Are you using Krisp or any other noise cancellation on the SIP trunk or agent side? (Yes/No) • Are SIP participants using narrow-band (8 kHz) audio codecs? • Are you using any custom audio processing (a custom

tts_node

,

AudioFrame

scaling, or

BVC()

vs

BVCTelephony()

filters)? What I’ll check or suggest once you confirm: • If the agent/TTS is too quiet: scale the TTS output before sending (adjust

AudioFrame

amplitude or use a custom

tts_node

) so the room receives higher gain. • If the SIP incoming audio is too quiet: ensure

BVCTelephony()

is used for SIP participants (better for narrow-band telephony audio) and avoid double noise-processing—disable redundant trunk-level noise cancellation if agent-side processing is also enabled. • Also verify frontend playback volume controls so client-side attenuation isn’t the cause. Tell me which direction is affected and the details above and I’ll give concrete steps tailored to your setup. Sources: Choosing the right noise cancellation for your agent | LiveKit | Agent speech and audio | LiveKit Documentation