We updated our NaturalHD text-to-speech voices. The update delivers higher-definition audio and can more naturally handle disfluencies (“um”, “uh”) and laughter with no changes to your API calls or carrier setup. This allows customers to enjoy more human-like conversations.


## Key benefits:



* **Clearer audio: **Telnyx** **NaturalHD delivers a noticeably crisper voice profile.
* **More emotion: **Refined prosody makes speech feel warmer and more engaged.
* **Authentic quirks: **“Um,” “uh,” and light laughter flow naturally without breaking rhythm.


## Hear the difference: 


* Natural: [natural.mp3](https://pleasant-sunrise-e14682326c.media.strapiapp.com/natural_fce6ad179a.mp3)
* NaturalHD: [natural_hd.wav](https://pleasant-sunrise-e14682326c.media.strapiapp.com/natural_hd_839bea9fc8.wav)
* NaturalHD with laugh: [natural_hd_laugh.wav](https://pleasant-sunrise-e14682326c.media.strapiapp.com/natural_hd_laugh_e115aae110.wav)



## Why does it matter?

Lifelike voices keep callers listening and help them trust what they hear. Telnyx Natural HD’s cleaner sound and conversational tone make menus easier to follow and reduce the urge to hang up. 

We have a flexible TTS voice line up. When you need extra language options, Azure Neural HD voices deliver premium clarity on many languages, while standard voices keep routine traffic economical. Switch between Telnyx Natural HD, Azure Neural HD, and standard voices with a single voice parameter. The mix lets you balance experience and cost on every interaction.


## Getting started

Follow these steps to start using Telnyx Natural HD voices. 

**If you’re using the AI Assistant Builder:**



1. Go to portal, select the AI, Storage and Compute sub-menu, click AI Assistants.
2. Create a new assistant and choose a voice provider from the dropdown. 
    1. If you select AWS, Azure, or ElevenLabs, you will need to select your integration secret.
3. Use the Voice Playground to preview the voice you have chosen.
4. Select your Transcription (Text-to-Speech) Model and create.

**If you’re using Voice API or TeXML:**



1. Make sure your [Voice API](https://developers.telnyx.com/docs/voice/programmable-voice/get-started) or [TeXML](https://developers.telnyx.com/docs/voice/programmable-voice/texml-setup) application is correctly configured.
2. Pick a voice ID and add your configurations using the  [TTS guide. ](https://developers.telnyx.com/docs/voice/programmable-voice/tts)
3. Assign a number to your application, then call the number to verify your TTS setup.
4. Swap voices or tiers whenever you need. No infrastructure changes or new carrier setups.

**For more details visit our **[developer documentation](https://developers.telnyx.com/docs/voice/programmable-voice/tts) and [start building today](https://telnyx.com/sign-up). 

Telnyx just launched Natural HD voices, our high-definition text-to-speech voices. Enjoy crisper audio, more natural prosody, and expressive touches like laughter and filler words for lifelike conversations.

Introducing Telnyx Natural HD Voices: Clearer, More Expressive TTS

Telnyx Natural HD text-to-speech voices bring human-like clarity to every conversation with higher-definition audio, more expressive prosody, and support for natural quirks like “um,” “uh,” and laughter. No changes needed to your current setup, just better sound instantly.

Telnyx Natural HD voices sound clearer and more expressive

We are excited to announce a major enhancement to the AI Agent Handoff tool: support for two distinct voice modes. Now, you can choose whether all your AI assistants speak with a unified voice for seamless handoffs, or let each assistant retain its own voice to create the experience of a team collaborating on the call. This update gives you greater flexibility to craft the most natural and effective conversations for your users.


## What’s new

This tool now gives you more control over the voice experience during multi-agent handoffs. Choose between:



* **Unified voice mode (existing)**: All AI agents share the same voice, making handoffs seamless and invisible to the user.
* **Distinct voice mode (new)**: Each agent keeps its unique voice settings, so handoffs feel like a collaborative team of specialists, just like a real conference call.


## Key benefits



* **Personalized experiences**: Give each AI agent its own voice and persona to reflect their unique expertise or function.
* **Seamless transitions**: Maintain a single voice for uninterrupted conversations, or highlight handoffs with distinct voices for clarity.
* **More natural multi-agent interactions**: Create the feel of a real team, helping users understand when different assistants are handling different parts of a conversation.
* **Flexible configuration**: Instantly switch between voice modes in your settings with no code changes.


## Why it matters

This update lets you tailor every user interaction, whether you want smooth, invisible handoffs or a collaborative, multi-expert environment where each assistant stands out.


## Getting started

It only takes a few minutes to get started.



1. [Sign up](https://telnyx.com/sign-up) or [log in](https://portal.telnyx.com/#/login/sign-in) to your Telnyx Mission Control Portal account.
2. Navigate to the AI Assistant tab.
3. Choose which AI Agent you want to edit.
4. On the Agent tab, click “Add tool” → “Handoff”.
5. In the “Add Handoff Tool” popup, choose “Unified” or “Distinct”.
6. Test your agent directly in the builder.

Telnyx introduces a new feature in its AI Agent Handoff tool, allowing users to choose between unified and distinct voice modes. Create seamless, single-voice experiences or personalize interactions with a team of AI voices with no code required.

Telnyx launches dual voice modes for AI Agent Handoff tool

Telnyx has enhanced the AI Agent Handoff tool with support for both unified and distinct voice modes. Now, businesses can deliver either seamless, single-voice conversations or a dynamic “AI team” experience where each assistant keeps its own voice, giving you more flexibility to design natural, personalized customer interactions.



Two voice modes now available in the AI Agent Handoff tool

We’re excited to announce that HD Voice is now enabled **for free** on U.S. Telnyx numbers.


## What’s new?

Starting July 7, we’re removing the $1 monthly charge and automatically enabling HD Voice on all US long-code numbers.


## Why are we enabling HD voice for all?

Over the past decade, we’ve invested in building a full-stack carrier that’s a direct peer on the telephony network, giving us the control to offer HD voice at scale. 

But our goal isn’t to sell HD voice as an add-on. Our mission is bigger than that. We’re engineering the future of voice AI, where crystal-clear, natural audio is required to deliver exceptional voice interactions. 

To us, HD voice is a foundation, not a feature. We don’t upsell the essentials.


## Getting started



* No action required, HD voice is now automatically enabled for all US numbers at no additional cost.
* For optimal performance, ensure your endpoints support wideband codecs like Opus, G.722, or AMR-WB.
* See our [HD Voice Number Feature Guide](https://support.telnyx.com/en/articles/8394071-hd-voice-number-feature) for details on compatibility.

This isn’t a promotion, but a permanent upgrade reflecting our commitment to creating the best platform for [Voice AI Agents](https://telnyx.com/products/voice-ai-agents), raising the bar for the industry and accelerating what’s possible.

Telnyx now includes HD Voice at no extra cost on all U.S. numbers. This permanent upgrade delivers clearer audio for AI voice agents and real-time calling with no setup required.

Telnyx enables free HD Voice for all U.S. numbers

HD Voice is now included for free on all U.S. Telnyx numbers. This upgrade reflects our commitment to better audio for AI voice agents and real-time conversations across the network.

Telnyx enables free HD Voice

Telnyx is excited to announce the launch of front-end AI Agent widgets. You can now embed fully interactive AI-powered assistants on your website using a simple code snippet, removing the need for additional front-end development.


## What’s new



* Create embeddable widgets for any Telnyx AI Agent.
* Generate a single code snippet to copy, paste, and go live.
* Let customers directly interact with your AI Agent.


## Key benefits



* **Rapid deployment**: Instantly add AI Agents to any web page without custom development or complex integration.
* **Enhanced customer experience**: Provide real-time, intelligent support, lead capture, and automation right where your users are.
* **Omnichannel engagement**: Leverage voice-based AI conversations and offer visible transcripts for accessibility.
* **Reduce dev lift**: Empower your teams to launch and update front-end AI experiences without heavy engineering resources.
* **Flexible and scalable**: Easily add, modify, or remove widgets as your business grows or needs change.


## Why it matters

Customers expect instant, intelligent support right on your website. With these new widgets, you can deploy AI Agents to your front-end in minutes, creating seamless customer experiences without extra development overhead. Agents engage via voice and can display a transcript of the conversation if preferred. Whether you’re resolving issues, capturing leads, or automating common requests, your AI Agent is now just a snippet away from going live.


## Getting started

It only takes a few minutes to get started.



1. [Sign up](https://telnyx.com/sign-up) or [log in](https://portal.telnyx.com/#/login/sign-in) to your Telnyx Mission Control Portal account.
2. Navigate to the AI Assistants section.
3. Choose which AI Agent you want to create a widget for. Click edit.
4. Move to the “Widget” tab.
5. Copy and paste the code to embed the AI Agent widget on your website.
6. Preview the widget and push live.

Telnyx now lets you deploy AI-powered agent widgets on your website in minutes. Enhance customer support, automate requests, and engage users directly with no extra development needed.

Instantly embed AI Agent widgets on your website with Telnyx

Telnyx introduces front-end AI Agent widgets, making it easy to embed interactive, voice-enabled assistants on your website. With just a code snippet, you can deliver real-time support, automate common tasks, and create seamless customer experiences without any additional development work.

Front-end AI Agent widgets

We’ve added SMS & MMS fallback support for [RCS messages](https://telnyx.com/products/rcs) in the Telnyx Messaging API. When RCS isn’t available on the recipient’s device or carrier, your message will still be delivered via the fallback channel you define.

### How will this help Telnyx users
Reliability is king in messaging. This feature ensures your RCS-first campaigns don’t hit dead ends, you maintain full coverage without manually rerouting traffic.

### How it works
Add fallback objects to your RCS send request:

"sms_fallback": {
"sms_fallback": {
  "from": "+13125551234",
  "text": "Hello world!"
},
"mms_fallback": {
  "from": "+13125551234",
  "subject": "Test Message",
  "media_urls": ["http://example.com/some_media.jpg"],
  "text": "Hello world!"
}

### Getting started
Start improving the reliability and coverage of your RCS workflows [via our API](https://developers.telnyx.com/api/messaging/send-an-rcs-message). 

When RCS isn’t available on the recipient’s device or carrier, your message will still be delivered via the fallback channel you define.

Automatic SMS & MMS Fallback for RCS

We’re expanding the reach of simultaneous ring beyond just sip trunking. You can now use this feature across a broader range of Telnyx voice applications, including programmable voice and Voice SDK (WebRTC) clients.


## What’s new

Register any mix of SIP endpoints or WebRTC clients under the same credentials and they will all ring together, no matter where the call starts. That includes:
- PSTN
- SIP trunk
- Programmable voice

Every active endpoint rings at once, and the first person or device to answer is instantly connected, enabling a more flexible and responsive call routing experience.



## Why it matters

**Fast response times**
Simultaneous ring delivers calls to all active endpoints at once, including softphones, desktop browsers and mobile clients. your team can answer the moment a call arrives, which reassures customers and shows you value their time.

**Shared access to numbers**
Instead of relying on one receptionist or device, your whole team can pick up incoming calls during business hours and mute notifications when they step away. that shared responsibility keeps calls moving and prevents overload.

**Real-time global coverage**
Distributed teams and international offices can share responsibility for phone coverage without altering your existing call flows, analytics or voicemail settings. Every call finds an available ear without complex forwarding rules.


## Getting started


1. [Sign up](https://telnyx.com/sign-up) or [log in](https://portal.telnyx.com/#/login/sign-in) to your Telnyx Mission Control Portal account.
2. Register each client with the same SIP credentials.
3. In Mission Control or through the Telnyx API, activate simultaneous ring for that credential set.
4. (Optional) Set an overflow rule. After a chosen ring time, route the call to voicemail, another ring group, or an IVR branch.
5. Test and Iterate: Use the built-in testing tools in the portal to simulate

[Get started today](https://telnyx.com/sign-up) and increase responsiveness and availability.


Improve call coverage and responsiveness with simultaneous ring for SIP trunking. Let all SIP devices ring at once and reduce missed calls and lost revenue.

Enable simultaneous ring for SIP Trunking, WebRTC at Telnyx

Never miss an important call again. With Telnyx’s new simultaneous ring feature for SIP trunking, all registered SIP devices can ring at once, keeping your team reachable across locations, shifts, and devices.

Simultaneous Ring Support

## Black-box API: Real-time service telemetry, programmatic alerts

Pull the same production-grade health data our NOC team uses—now accessible via a streamlined REST API. Integrate up-to-the-minute latency, success, and error metrics into your own monitoring, alerting, and automation workflows for greater visibility and faster incident response.

### What’s new

- **Black-box results API**: Query core service metrics—latency, success rates, 5XX errors—direct from the Telnyx SETI platform
- **Programmatic access**: Pull health status into Grafana, Datadog, CI/CD gates, or custom bots with a single GET request
- **Granular filtering**: Filter by product (e.g., `filter[product]=messaging` or `voice`) so alerts stay relevant to your deployed services
- **Plain JSON output**: No SDKs required, making integration with internal dashboards and pipelines fast and straightforward
- **Production parity**: Access the same test data that powers our own uptime checks, for reliable early warning and incident prevention

### Why it matters

Mission-critical voice, messaging, and API workloads can’t afford surprises. With direct API access to real-time health telemetry, IT teams and operations leaders get the same trusted visibility as Telnyx engineers—enabling proactive alerting, rapid troubleshooting, and automated rollbacks before users or compliance teams are impacted. This helps regulated industries, high-volume contact centers, and multi-site operations maintain uptime and resolve issues faster, reducing risk and support burden.

### How to get started

1. Make a GET request to the endpoint: `https://api.telnyx.com/v2/seti/black_box_test_results` with the header `Accept: application/json`
2. Add filters such as `?filter[product]=voice` to target health data for specific Telnyx services you use
3. Connect the API output to your monitoring tool, alerting logic, or CI/CD pipeline—no additional libraries required
4. Test integration by validating that your system ingests and displays real-time results; set custom alert thresholds as needed

[Get started](https://telnyx.com/sign-up) today to transform AI conversations into meaningful, ongoing relationships.


Monitor Telnyx service uptime and incidents in real time with our API. Get latency, error, and success metrics for faster, automated response.

New: Real-time API for service uptime and incident alerts

Plan your outreach like clockwork. With Scheduled Messaging, you can now set precise delivery times for SMS, MMS, and RCS messages. 

Whether it’s a campaign launch at midnight, or a reminder that goes out exactly 24 hours before an event, you can now programmatically schedule outbound SMS/MMS by including the "send_at"  field in your POST - v2/messages request. 

### Why it matters
Timing can be the difference between engagement and being ignored. Now you can coordinate multi-channel messaging, align with campaign launches, and avoid manual “send” clicks. Here's a couple of ways Telnyx customers are using Scheduled Messages:

- Appointment reminders timed to maximize attendance
- Coordinated product launches across time zones
- Follow-up sequences that run automatically

### Getting started

Telnyx Messaging customers can start using our new Scheduled Messages feature right away. Take a look at the [quickstart guide](https://developers.telnyx.com/docs/messaging/messages/schedule-message) to get up and running quickly or dive into [the API](https://developers.telnyx.com/api/messaging/schedule-message).

Scheduled Messaging enables users to set precise delivery times for SMS, MMS, and RCS messages. 

Schedule SMS, MMS, and RCS messages

Scheduled Messaging for SMS, MMS, and RCS

We’ve added Azure Neural HD voices to our text‑to‑speech lineup. With this update, you can pick from a wider range of crisp, expressive voices, all accessible through the same Telnyx Programmable Voice API.

## Key benefits:

**Human‑like speech generation:** Trained on millions of multilingual utterances, Azure Neural HD voices produce natural pacing, rhythm, and emotion 

**Conversational realism:** Automatically reproduces spontaneous pauses, emphasis, and filler words so interactions sound like live dialogue.

**Dynamic variation:** Introduces subtle variations in every delivery to avoid robotic repetition and keep listeners engaged.
**More choice, less lock‑in:** Toggle between Telnyx voices and Microsoft Azure Neural HD voices with a single request parameter. No new contracts or infrastructure changes.

**Bring your own carrier (BYOC):** Continue routing calls over the carrier of your choice using the existing API key. Your voice, your network.

**Transparent, pay‑as‑you‑go pricing:** TTS Azure HD: $0.000045 per character, so you only pay for what you use.

## Why it matters

Voice quality directly shapes caller behavior. Natural‑sounding speech cuts hang‑ups and increases survey completion rates. Azure HD gives you that extra clarity for premium real-time voice interactions, while other options keep routine traffic within budget. You can choose voices that fit best with the intent.


## Getting started

Follow these steps to start using Azure HD voices. 

1. Before starting, please make sure your [Voice API ](https://developers.telnyx.com/docs/voice/programmable-voice/get-started) or [TeXML ](https://developers.telnyx.com/docs/voice/programmable-voice/texml-setup) application is correctly configured.
2. Pick a voice ID in the format in the format Azure.<locale>-<VoiceName>  for example 
```
Azure.en-US-Emma:DragonHDLatestNeural
```
3. Add your configurations using the [TTS guide](https://developers.telnyx.com/docs/voice/programmable-voice/tts). 
4. Assign a number to your application, then call the number to verify your TTS setup.
5. Swap voices or tiers whenever you need. No infrastructure changes or new carrier setups.

For more details visit our [developer documentation](https://developers.telnyx.com/docs/voice/programmable-voice/tts) and [start building today ](https://telnyx.com/sign-up).



Pick crisp, expressive Azure Neural Hd voices in Telnyx TTS.  Pay just $0.000045 per character , keep byoc routing and swap voices with one request.

Azure Neural HD voices join Telnyx text-to-speech lineup

Azure Neural HD voices now live in Telnyx Programmable Voice


**What's new:**
We’ve enhanced the Private PGW (PvT PGW) feature to support static IP address allocation. Now, every time a device connects to the wireless network, it will be assigned the same private IP address rather than a new one for each session.

**How it works:**

* The static IP is automatically assigned to a SIM when it’s added to a SIM group linked to a PvT PGW.
* If the SIM is moved to a different SIM group, the IP address is removed from the SIM.
* This ensures each device in a given group always receives the same IP address for every connection.

**Benefits:**

* **Consistency:** Devices are always reachable at the same IP, ideal for remote access, running servers, or firewall/port forwarding configurations.
* **Simplified network management:** Track and manage devices by their fixed IP addresses.
* **Improved policy enforcement:** Reserved services, permissions, and restrictions are easier to manage for individual devices.

**Availability:**

* All new PvT PGWs will include static IP allocation by default.
* To use this feature, customers with legacy PvT PGWs must create a new PvT PGW and move their SIM groups. Existing PvT PGWs will **not** be upgraded automatically, to avoid disrupting live services.



Private PGW now supports static IP address allocation

We are excited to share that you can now upload files or add URLs directly into your AI Agents—no API calls or developer action needed. This enables teams to get up and running with relevant content in minutes.


## What’s new



* Drag and drop file upload. Instantly add documents through the web portal.
* URL-based knowledge base creation. Ingest web content for assistant training.
* No-code configuration. Non-technical users can manage and update knowledge sources.
* Real-time updates. Add or replace files and URLs at any time to keep assistants current.
* API and portal parity. Everything previously possible via API is now visual.


## Why it matters

Every team, spanning industries like healthcare, insurance, banking, logistics, and retail can now keep Telnyx AI Agents informed with up-to-date policies, FAQs, and workflows with no developer bottlenecks. This reduces onboarding time for new initiatives and ensures every voice and messaging channel delivers consistent, compliant information.


## Getting started

It only takes a few minutes to get started.



1. [Sign up](https://telnyx.com/sign-up) or [log in](https://portal.telnyx.com/#/login/sign-in) to your Telnyx Mission Control Portal account.
2. Navigate to the AI Assistants section.
3. Select your AI assistant.
4. Upload or link your knowledge sources.
5. Validate responses in the portal.

This is how we help operational and compliance teams move faster and stay accurate—across every conversation.

Upload files or add URLs directly to Telnyx AI Agents with no coding required. Launch compliant, consistent AI workflows in minutes.

No-code knowledge base setup for Telnyx AI Agents

You can now drag and drop files or link URLs to train your Telnyx AI Agents with no developer needed. Set up knowledge bases in minutes and keep content up to date effortlessly.

Simplified knowledge base setup for AI Agents

Telnyx just released multi-agent handoffs, enabling seamless expertise in every conversation. AI Agents can collaborate in real time, sharing context and expertise within a single conversation.


## What’s new



* Route tasks between specialized AI assistants in one uninterrupted session.
* Maintain unified context. Every agent sees the same history, so there’s no need to repeat yourself.
* Consistent voice and tone. Users interact with one seamless AI, even as requests move between bots.
* Handoff is invisible to the end user. No confusion, no context loss.
* Assign the right specialist to each task—scheduling, claims, compliance, order status, and more.


## Why it matters

High-volume support operations don’t have time for fragmentation. Scheduling, claims, and compliance calls each demand their own expertise. Multi-agent handoff lets you deliver targeted support without juggling separate bots or losing track of the conversation. That means lower handle times, fewer errors, and a better experience for your users, especially where compliance and accuracy are non-negotiable.


## Getting started



1. [Sign up](https://telnyx.com/sign-up) or [log in](https://portal.telnyx.com/#/login/sign-in) to your Telnyx Mission Control Portal account.
2. Navigate to the AI Assistants section.
3. Set up domain-specific assistants for your workflows and configure the handoff rules.
4. Test directly in the builder to ensure everything runs smoothly.

This is how modern support scales expertise, reduces friction, and keeps customer experience consistent no matter the complexity.


Seamlessly route conversations between specialized AI Agents with shared context, consistent tone, and no user disruption—only on Telnyx.

Multi-agent handoff now available for Telnyx AI Assistants

Telnyx AI Assistants now support multi-agent handoff. Route tasks between bots without losing context or breaking flow, delivering seamless, expert support in every conversation.

Release notes