Custom Voicemail Greetings Now Available for Telnyx Phone Numbers

Custom voicemail greetings are now available for Telnyx phone numbers. Personalize what callers hear when they reach voicemail with custom text-to-speech messages or uploaded audio files, configured per number through Mission Control or the API.

What's new

• Custom TTS greetings: Write your own greeting text, choose a TTS voice, preview it, and activate it. Telnyx renders the text into audio and stores it for playback on every voicemail call.
• Custom audio file greetings: Upload your own pre-recorded greeting via POST /v2/media and reference it in the voicemail configuration by media name.
• Per-number configuration: Each phone number gets its own greeting. Configure different messages for different numbers, departments, or regions.
• Mission Control UI with preview: Select a TTS voice, type your greeting, click Preview TTS to hear it, then click Use this greeting to render and activate. No API call required.
• API configuration: Set greetings programmatically via POST /v2/phone_numbers/{number_id}/voicemail with greeting mode and media name fields.
• Automatic fallback: If a custom greeting cannot be played for any reason, the system falls back to the default Telnyx greeting, so callers always hear something.

Why it matters

The default voicemail greeting is generic. It reads back the dialed number and prompts the caller to leave a message. For businesses routing calls through Telnyx, that generic greeting undermines brand consistency the moment a call hits voicemail.

Custom greetings let you match the caller experience to your brand voice. A clinic can greet patients by name. A support line can include business hours. A regional office can use a local language greeting.

Example use cases

• Customer support lines that include business hours, alternative contact methods, and expected response times in the greeting.
• Healthcare clinics greeting patients with a professional message recorded in a calm voice, including after-hours instructions.
• Regional offices that need greetings in the local language or dialect for each phone number.
• Sales teams that rotate promotional messages in their voicemail greeting for active campaigns.
• Multi-tenant platforms that let each sub-account customize their own voicemail greeting per number.

Getting started

1. In Mission Control, navigate to Phone Numbers and select the number you want to configure.
2. Open the Voice tab and go to Voicemail settings for that number.
3. In the Greeting section, select Custom greeting.
4. Choose a TTS voice from the voice selector dropdown.
5. Enter your custom greeting text in the greeting text field.
6. Click Preview TTS to hear how your greeting will sound.
7. Click Use this greeting to render and activate the greeting.

To configure via the API, upload your greeting audio using POST /v2/media, then set the greeting mode and media name:

curl -X POST "https://api.telnyx.com/v2/phone_numbers/{number_id}/voicemail" \
  -H "Authorization: Bearer ***" \
  -H "Content-Type: application/json" \
  -d '{
    "enabled": true,
    "pin": "1234",
    "greeting": {
      "mode": "custom_greeting",
      "media_name": "custom_greeting_acme"
    }
  }'

Learn more in the Custom Voicemail Greetings docs

Currently supported in the US. Availability in other regions may vary. The default greeting will be used where custom greeting is unavailable.