Telnyx Voice Media Python

team-telnyx/telnyx-voice-media-python

>- Play audio files, use text-to-speech, and record calls. Use when building IVR systems, playing announcements, or recording conversations. This skill provides Python SDK examples.

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Install

one command, takes just this skill from the repository

npx skills add https://github.com/team-telnyx/ai --skill telnyx-voice-media-python

The instruction itself

14 sections, as written by the author

Telnyx Voice Media - Python

Installation

pip install telnyx

Setup

import os
from telnyx import Telnyx

client = Telnyx(
    api_key=os.environ.get("TELNYX_API_KEY"),  # This is the default and can be omitted
)

All examples below assume client is already initialized as shown above.

Error Handling

All API calls can fail with network errors, rate limits (429), validation errors (422),

or authentication errors (401). Always handle errors in production code:

import telnyx

try:
    result = client.messages.send(to="+13125550001", from_="+13125550002", text="Hello")
except telnyx.APIConnectionError:
    print("Network error — check connectivity and retry")
except telnyx.RateLimitError:
    # 429: rate limited — wait and retry with exponential backoff
    import time
    time.sleep(1)  # Check Retry-After header for actual delay
except telnyx.APIStatusError as e:
    print(f"API error {e.status_code}: {e.message}")
    if e.status_code == 422:
        print("Validation error — check required fields and formats")

Common error codes: 401 invalid API key, 403 insufficient permissions,

404 resource not found, 422 validation error (check field formats),

429 rate limited (retry with exponential backoff).

Play audio URL

Play an audio file on the call. If multiple play audio commands are issued consecutively,

the audio files will be placed in a queue awaiting playback. *Notes:*

When overlay is enabled, target_legs is limited to self.

POST /calls/{call_control_id}/actions/playback_start

Optional: audio_type (enum: mp3, wav), audio_url (string), cache_audio (boolean), client_state (string), command_id (string), loop (string), media_name (string), overlay (boolean), playback_content (string), stop (string), target_legs (string)

response = client.calls.actions.start_playback(
    call_control_id="550e8400-e29b-41d4-a716-446655440000",
    audio_url="https://example.com/audio.mp3",
)
print(response.data)

Returns: result (string)

Stop audio playback

Stop audio being played on the call. Expected Webhooks:

call.playback.ended or call.speak.ended

POST /calls/{call_control_id}/actions/playback_stop

Optional: client_state (string), command_id (string), overlay (boolean), stop (string)

response = client.calls.actions.stop_playback(
    call_control_id="550e8400-e29b-41d4-a716-446655440000",
)
print(response.data)

Returns: result (string)

Record pause

Pause recording the call. Recording can be resumed via Resume recording command. Expected Webhooks:

There are no webhooks associated with this command.

POST /calls/{call_control_id}/actions/record_pause

Optional: client_state (string), command_id (string), recording_id (uuid)

response = client.calls.actions.pause_recording(
    call_control_id="550e8400-e29b-41d4-a716-446655440000",
)
print(response.data)

Returns: result (string)

Record resume

Resume recording the call. Expected Webhooks:

There are no webhooks associated with this command.

POST /calls/{call_control_id}/actions/record_resume

Optional: client_state (string), command_id (string), recording_id (uuid)

response = client.calls.actions.resume_recording(
    call_control_id="550e8400-e29b-41d4-a716-446655440000",
)
print(response.data)

Returns: result (string)

Recording start

Start recording the call. Recording will stop on call hang-up, or can be initiated via the Stop Recording command. Expected Webhooks:

call.recording.saved
call.recording.transcription.saved
call.recording.error

POST /calls/{call_control_id}/actions/record_start — Required: format, channels

Optional: client_state (string), command_id (string), custom_file_name (string), max_length (int32), play_beep (boolean), recording_track (enum: both, inbound, outbound), timeout_secs (int32), transcription (boolean), transcription_engine (enum: A, B, deepgram/nova-3), transcription_language (enum: af, af-ZA, am, am-ET, ar, ar-AE, ar-BH, ar-DZ, ar-EG, ar-IL, ar-IQ, ar-JO, ar-KW, ar-LB, ar-MA, ar-MR, ar-OM, ar-PS, ar-QA, ar-SA, ar-TN, ar-YE, as, auto_detect, az, az-AZ, ba, be, bg, bg-BG, bn, bn-BD, bn-IN, bo, br, bs, bs-BA, ca, ca-ES, cs, cs-CZ, cy, da, da-DK, de, de-AT, de-CH, de-DE, el, el-GR, en, en-AU, en-CA, en-GB, en-GH, en-HK, en-IE, en-IN, en-KE, en-NG, en-NZ, en-PH, en-PK, en-SG, en-TZ, en-US, en-ZA, es, es-419, es-AR, es-BO, es-CL, es-CO, es-CR, es-DO, es-EC, es-ES, es-GT, es-HN, es-MX, es-NI, es-PA, es-PE, es-PR, es-PY, es-SV, es-US, es-UY, es-VE, et, et-EE, eu, eu-ES, fa, fa-IR, fi, fi-FI, fil-PH, fo, fr, fr-BE, fr-CA, fr-CH, fr-FR, gl, gl-ES, gu, gu-IN, ha, haw, he, hi, hi-IN, hr, hr-HR, ht, hu, hu-HU, hy, hy-AM, id, id-ID, is, is-IS, it, it-CH, it-IT, iw-IL, ja, ja-JP, jv-ID, jw, ka, ka-GE, kk, kk-KZ, km, km-KH, kn, kn-IN, ko, ko-KR, la, lb, ln, lo, lo-LA, lt, lt-LT, lv, lv-LV, mg, mi, mk, mk-MK, ml, ml-IN, mn, mn-MN, mr, mr-IN, ms, ms-MY, mt, my, my-MM, ne, ne-NP, nl, nl-BE, nl-NL, nn, no, no-NO, oc, pa, pa-Guru-IN, pl, pl-PL, ps, pt, pt-BR, pt-PT, ro, ro-RO, ru, ru-RU, rw-RW, sa, sd, si, si-LK, sk, sk-SK, sl, sl-SI, sn, so, sq, sq-AL, sr, sr-RS, ss-latn-za, st-ZA, su, su-ID, sv, sv-SE, sw, sw-KE, sw-TZ, ta, ta-IN, ta-LK, ta-MY, ta-SG, te, te-IN, tg, th, th-TH, tk, tl, tn-latn-za, tr, tr-TR, ts-ZA, tt, uk, uk-UA, ur, ur-IN, ur-PK, uz, uz-UZ, ve-ZA, vi, vi-VN, xh-ZA, yi, yo, yue-Hant-HK, zh, zh-TW, zu-ZA), transcription_max_speaker_count (int32), transcription_min_speaker_count (int32), transcription_profanity_filter (boolean), transcription_speaker_diarization (boolean), trim (enum: trim-silence)

response = client.calls.actions.start_recording(
    call_control_id="550e8400-e29b-41d4-a716-446655440000",
    channels="single",
    format="wav",
)
print(response.data)

Returns: result (string)

Recording stop

Stop recording the call. Expected Webhooks:

call.recording.saved

POST /calls/{call_control_id}/actions/record_stop

Optional: client_state (string), command_id (string), recording_id (uuid)

response = client.calls.actions.stop_recording(
    call_control_id="550e8400-e29b-41d4-a716-446655440000",
)
print(response.data)

Returns: result (string)

Speak text

Convert text to speech and play it back on the call. If multiple speak text commands are issued consecutively, the audio files will be placed in a queue awaiting playback. Expected Webhooks:

call.speak.started
call.speak.ended

POST /calls/{call_control_id}/actions/speak — Required: payload, voice

Optional: client_state (string), command_id (string), language (enum: arb, cmn-CN, cy-GB, da-DK, de-DE, en-AU, en-GB, en-GB-WLS, en-IN, en-US, es-ES, es-MX, es-US, fr-CA, fr-FR, hi-IN, is-IS, it-IT, ja-JP, ko-KR, nb-NO, nl-NL, pl-PL, pt-BR, pt-PT, ro-RO, ru-RU, sv-SE, tr-TR), loop (string), payload_type (enum: text, ssml), service_level (enum: basic, premium), stop (string), target_legs (enum: self, opposite, both), voice_settings (object)

response = client.calls.actions.speak(
    call_control_id="550e8400-e29b-41d4-a716-446655440000",
    payload="Say this on the call",
    voice="female",
    language="en-US",
)
print(response.data)

Returns: result (string)

Webhooks

Webhook Verification

Telnyx signs webhooks with Ed25519. Each request includes telnyx-signature-ed25519

and telnyx-timestamp headers. Always verify signatures in production:

# In your webhook handler (e.g., Flask — use raw body, not parsed JSON):
@app.route("/webhooks", methods=["POST"])
def handle_webhook():
    payload = request.get_data(as_text=True)  # raw body as string
    headers = dict(request.headers)
    try:
        event = client.webhooks.unwrap(payload, headers=headers)
    except Exception as e:
        print(f"Webhook verification failed: {e}")
        return "Invalid signature", 400
    # Signature valid — event is the parsed webhook payload
    print(f"Received event: {event.data.event_type}")
    return "OK", 200

The following webhook events are sent to your configured webhook URL.

All webhooks include telnyx-timestamp and telnyx-signature-ed25519 headers for Ed25519 signature verification. Use client.webhooks.unwrap() to verify.

| Event | Description |

|-------|-------------|

| callPlaybackEnded | Call Playback Ended |

| callPlaybackStarted | Call Playback Started |

| callRecordingError | Call Recording Error |

| callRecordingSaved | Call Recording Saved |

| callRecordingTranscriptionSaved | Call Recording Transcription Saved |

| callSpeakEnded | Call Speak Ended |

| callSpeakStarted | Call Speak Started |

Webhook payload fields

callPlaybackEnded

| Field | Type | Description |

|-------|------|-------------|

| data.record_type | enum: event | Identifies the type of the resource. |

| data.event_type | enum: call.playback.ended | The type of event being delivered. |

| data.id | uuid | Identifies the type of resource. |

| data.occurred_at | date-time | ISO 8601 datetime of when the event occurred. |

| data.payload.call_control_id | string | Call ID used to issue commands via Call Control API. |

| data.payload.connection_id | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |

| data.payload.call_leg_id | string | ID that is unique to the call and can be used to correlate webhook events. |

| data.payload.call_session_id | string | ID that is unique to the call session and can be used to correlate webhook events. |

| data.payload.client_state | string | State received from a command. |

| data.payload.media_url | string | The audio URL being played back, if audio_url has been used to start. |

| data.payload.media_name | string | The name of the audio media file being played back, if media_name has been used to start. |

| data.payload.overlay | boolean | Whether the stopped audio was in overlay mode or not. |

| data.payload.status | enum: file_not_found, call_hangup, unknown, cancelled, cancelled_amd, completed, failed | Reflects how command ended. |

| data.payload.status_detail | string | Provides details in case of failure. |

callPlaybackStarted

| Field | Type | Description |

|-------|------|-------------|

| data.record_type | enum: event | Identifies the type of the resource. |

| data.event_type | enum: call.playback.started | The type of event being delivered. |