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LiveKit Agentsupdated Jun 14, 2025 · hospitality · support

Hotel Front Desk Agent with Smart Backchannel Filtering

A voice agent that continues speaking through caller backchannels like 'mhm', 'um', and 'yeah' without interrupting, while still responding to real intents. Demonstrates three filtering strategies for handling short utterances during agent speech: STT node override, buffer clearing, and combined approach.

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The numbers

latency—

cost / min—

frameworkLiveKit Agents

The stack

telephonyWeb Only

speech-to-textAssemblyAI Streaming

llmGPT-4.1

text-to-speechCartesia Sonic-3

System prompt

No prompt published.

Config

config.json

{
  "vad": null,
  "backchannels": [
    "mhm",
    "um",
    "uh",
    "yeah",
    "okay",
    "ok",
    "hmm",
    "mmhmm",
    "uhhuh",
    "right",
    "got it"
  ],
  "interruption": {
    "min_words": 2
  },
  "filter_grace_s": 1,
  "turn_detection": "stt",
  "filter_strategies": [
    "stt_node_override",
    "buffer_clearing",
    "combined"
  ]
}

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