voice-telephonylisted

# Voice Telephony This skill decides what changes when the agent runs on a phone line instead of a browser. It covers the call path, answering machine detection, DTMF, transfers, narrowband audio, and the outbound calling controls a compliance review will ask for. ## Use this when - An outbound call reaches voicemail and the agent talks into the recording. - A transfer drops the caller instead of reaching a person. - Transcription accuracy falls on the phone but holds up in the browser test. - The agent must navigate a keypad menu to reach an extension. - You are moving a working web demo onto a phone number. ## Do not - Do not greet before answering machine detection returns on an outbound call. - Do not treat an uncertain detection result as human, and do not deliver the message into it. Probe, then branch. - Do not attempt a warm transfer with no hold experience. Silence reads as a dropped call. - Do not assume HD audio. The line is 8 kHz and that changes the STT and the floors. - Do not record without announcing it in the first agent utterance. - Do not dial before checking time-of-day rules in the callee's local time zone. - Do not reuse the inbound prompt for outbound calls. Outbound speaks second, not first. ## The path of a call `carrier ──> SIP trunk ──> media server ──> room or session ──> agent worker` - Carrier: the number is unrouted or unported, or the callee's carrier blocks it as spam. - SIP trunk: authentication fails, or the codec negotiates to somet