Abhishek Sharma

OpenAI models gpt-5.1, gpt-5, gpt-4.1, and gpt-4o are now available directly in the Telnyx model selector. This update reduces external setup steps and gives teams a faster way to deploy OpenAI models across Voice AI, messaging, and automation workflows.

## What’s new

* **Native OpenAI models:** gpt-5.1, gpt-5, gpt-4.1, and gpt-4o selectable in the model dropdown.
* **Unified billing:** Usage billed by Telnyx at OpenAI list prices with no markup.
* **BYO OpenAI keys:** Optional override to connect your own API keys.
* **Consistent interface:** Same configuration flow as other Telnyx-hosted models.

## Why it matters

* Reduces integration friction for teams already using OpenAI.
* Simplifies cost tracking by consolidating usage into Telnyx billing.
* Improves deployment speed for new assistants.
* Supports easy migration from external agent platforms like ElevenLabs and Vapi.

## Example use cases

* Importing Retell, Vapi, or ElevenLabs assistants directly into Telnyx.
* Migrating existing OpenAI-powered voice or chat flows without code changes.
* Running model comparisons alongside other providers in the same workspace.

## Getting started

1. Open Mission Control Portal → AI Assistance → Model selector.
2. Choose an OpenAI model (gpt-5.1, gpt-5, gpt-4.1, or gpt-4o).
3. Save the assistant and run a test message or call.

**Try out the integration in the [Mission Control Portal](https://portal.telnyx.com/#/ai/assistants)**


Select gpt-5.1, gpt-5, gpt-4.1 or gpt-4o directly in Telnyx  with no external setup and a unified billing

OpenAI models now available in Telnyx model selector

Native OpenAI model support in Telnyx model selector

The Voice tab now includes two adjustments for Telnyx Assistants. You can set speech speed for Natural HD voices and you can control background audio volume for predefined media.

## What’s new

* **Voice speed control:** Set faster or slower playback for Natural HD voices.  
* **Background audio volume:** Adjust volume levels for predefined media assets.

## Why it matters

* Reduces the need for external audio processing.  
* Improves tuning for branded or environment-specific voice profiles.  
* Simplifies control of media balance during scripted interactions.

## Example use cases

* Slowing speech for support flows with complex instructions.  
* Reducing background track volume during key prompts.

## Getting started

1. Open [Mission Control Portal](https://portal.telnyx.com/#/ai/assistants) and navigate to Voice AI.  
2. Select your Assistant and open the Voice tab.  
3. Adjust voice speed and background audio volume.  
4. Save and test your configuration.

**Try it out here** [Mission Control Protocol](https://portal.telnyx.com/#/ai/assistants).

Telnyx Assistants now let you set voice speed and adjust background audio volume to fine-tune scripted calls and branded voice flows.

New voice speed and background-audio controls in Telnyx Voice AI Agents

New controls for voice speed and background audio

Customers who have [enabled recording](https://support.telnyx.com/en/articles/5377454-call-recording), can now review AI Assistant call recordings and transcripts in a single portal view. This change speeds up debugging by linking audio, model behavior, and transcript output in one workflow. 

## What’s new

* **Unified playback view:** Listen to recordings while reading the aligned transcript.
* **Timestamp linking:** Jump between transcript lines and the exact audio position.
* **Event correlation:** See assistant turns, user input, and model responses in sequence.
* **Recording toggle control:** Enable or disable recording at the assistant level.
* **Improved error visibility:** Inspect misfires where audio and transcript diverge.

## Why it matters

* Reduces time spent reproducing issues.
* Improves visibility into recognition errors.
* Simplifies QA for voice intent handling.
* Prevents guesswork when tuning prompts or guardrails.

## Example use cases

* Reviewing misclassified intents after production calls.
* Auditing assistant behavior for compliance checks.
* Validating prompt updates before broad rollout.

## Getting started

1. Open Mission Control Portal → Voice AI → Assistants.
2. Select an assistant and [enable call recording](https://support.telnyx.com/en/articles/5377454-call-recording) if not already active.
3. Navigate to the session list and open any session with a recording.
4. Use the playback panel to scrub audio and inspect transcript alignment.

**Try it out** in our [Mission Control Protocol](https://portal.telnyx.com/#/ai/assistants).

Review AI Assistant call recordings and transcripts in a single view to improve debugging and QA for voice assistants.

AI Assistant recordings & transcript review in portal

AI Assistant recordings and transcripts now viewable together in the portal

Telnyx Voice AI Assistants can now run on GPT-5.1, which increases response quality and reduces latency for common dialog flows. This lets developers handle more turns with fewer retries and less custom prompt logic.

**What’s new**

* **Model option:** Select GPT-5.1 in Assistant settings or via API.  
* **Faster responses:** Lower average latency for short and mid-length prompts.  
* **Instruction handling:** Improved adherence to system and tool instructions.  
* **Tool reliability:** Higher success rate when invoking multi-step workflow tools.  
* **Conversational tuning:** More natural replies in long dialogs.

**Why it matters**

* Reduces caller wait time during back-and-forth exchanges.  
* Improves task completion for structured workflows.  
* Simplifies prompt design because the model follows constraints more reliably.  
* Prevents failures in long interactions that rely on consistent tool outputs.

**Example use cases**

* Customer support flows that require multi-turn reasoning.  
* Sales qualification calls with branching logic.  
* Healthcare scheduling that depends on accurate tool invocation.  
* Any conversational agent that needs faster and more natural responses.

**Getting started**

1. Open [Mission Control Portal](https://portal.telnyx.com/#/ai/assistants) and navigate to AI Assistants.  
2. Select an existing Assistant or create a new one.  
3. Choose GPT-5.1 as the model in the configuration panel.  
4. Test conversational and tool-based flows.

**Try it out here** [Mission Control Protocol](https://portal.telnyx.com/#/ai/assistants).

AI Assistants on Telnyx now support GPT-5.1, improving response quality and reducing latency for multi-turn voice workflows.

GPT-5.1 now available in Telnyx Voice AI Assistants

Telnyx Voice AI Assistants now support GPT-5.1

We’re excited to announce a new integration between [Telnyx Voice AI Agents](https://telnyx.com/products/voice-ai-agents) and [Sabre](https://www.sabre.com/), a leading software and technology provider for the global travel industry.

This integration brings real-time voice automation to travel operations, enabling customers to search and book flights, and modify bookings simply by speaking.

## **Voice AI Agents that work for travel providers**

With the new Sabre integration, Telnyx Voice AI Agents can:
- **Automate routine customer requests**, such as searching for flights, making new bookings, and modifying existing ones.
- **Reduce call volumes** and wait times by handling common booking requests autonomously, 24/7.

## **How it works**
Telnyx Voice AI Agents connect directly to Sabre’s APIs through Telnyx’s global communications network. When a customer calls, the AI agent interprets the request, retrieves the relevant data from Sabre, and responds in real time, all while maintaining context across multi-step conversations.

[View the Demo](https://telnyx.com/resources/integration-telnyx-sabre-voice-ai)

Because Telnyx owns its full technology stack, from telephony to AI infrastructure, these interactions happen with low latency, reliability, and full data control.

## **Key benefits**
- **Faster resolutions**: Real-time automation shortens response and rebooking times.
- **Improved Customer Experience**: Passengers get instant, natural voice assistance without long queues.
- **Operational efficiency**: AI Agents handle repetitive tasks, freeing human agents for high-value cases.
- **Global scalability**: Powered by Telnyx’s private, carrier-grade network for consistent performance anywhere in the world.
- **Data control and reliability**: Full-stack infrastructure ensures secure, compliant, and predictable voice automation.


## **How to get started with the Sabre Integration for Voice AI Agents**
Set up your Voice AI Agents on the Telnyx [Mission Control Portal](https://telnyx.com/sign-up), connect them to your Sabre environment, and start automating customer interactions and operations in minutes.

[Learn more](https://telnyx.com/solutions/travel-and-hospitality)


Discover how Telnyx Voice AI integrates with Sabre to automate travel bookings and itinerary changes through natural voice.

Telnyx Voice AI integrates with Sabre

We’re excited to announce a new integration between Telnyx Voice AI Agents and Sabre, a leading software and technology provider for the global travel industry.

Telnyx now imports Retell multi-state agents as a native multi-agent graph. This preserves state boundaries and uses deterministic handoff, which stabilizes branching and reduces failure rates in state-driven call flows.

## What’s new

* **State detection:** Importer reads all Retell states, tools, and transitions.  
* **Assistant-per-state mapping:** Each state becomes a Telnyx assistant with its own instructions and tools.  
* **Deterministic handoff:** Retell transitions convert to Agent Handoff Tool rules.  
* **Context continuity:** Dynamic variables and metadata transfer across assistants.  
* **Voice and model mapping:** Retains Retell voice, transcription, and model settings.  
* **Import modes:** Supports flattening into one assistant or a multi-assistant graph.

## Why it matters

* Restores the structure of multi-state Retell agents that previously collapsed into a single prompt.  
* Prevents incorrect tool execution and broken transitions in multi-step workflows.  
* Improves predictability for branching paths such as callbacks, bookings, or escalations.  
* Preserves context across assistants to avoid repeated questions or lost variables.

## Example use cases

* Lead qualification flows with multiple branching states.  
* Appointment or tour scheduling with dedicated tools per state.  
* Compliance workflows that require isolated logic per state.

## Getting started

1. In Mission Control Portal, open Assistants and select **Import assistant**.  
2. Choose **Retell** as the source and confirm your stored Retell API key.  
3. Select the Retell multi-prompt agent you want to import.  
4. Load available agents and choose the one to import.  
5. Review the generated assistants. Each Retell state appears as its own Telnyx assistant with mapped handoff rules.  
6. Inspect the workflow graph to confirm transitions match the original Retell prompt tree.  
7. Test the imported workflow directly from the assistant view and review handoff events in Conversation History.

Head over to your [mission control portal](https://portal.telnyx.com/#/ai/assistants) to try this today

Telnyx’s importer now handles Retell multi-state agents as native multi-assistant graphs, improving workflow stability and context continuity.

Retell multi-prompt agent import with Telnyx workflows

Retell multi-prompt agent import with native Telnyx multi-agent workflows

We're continuing to grow where it counts. Telnyx has officially added local outbound voice capabilities in Kuwait, Ukraine, and Russia bringing our total coverage to 84 countries with 2-way voice. This update expands opportunities for businesses looking to build localized voice experiences across more markets without the complexity of managing multiple carriers or infrastructure partners. It is just another step in our commitment to delivering global voice infrastructure.

**New number types now available for local outbound calling:**
- Kuwait – Geographical
- Ukraine – National
- Russia – Mobile


## Key Benefits:

- **Expanded Global Reach:** Engage your customers effectively with a trusted local presence.
- **Better Answer Rates:** Local numbers lead to improved call answer rates and customer trust. It’s a small change that makes a noticeable impact,especially in markets where customers are wary of unknown numbers.
- **Simplified Compliance:** Local dialing formats help support regulatory best practices.

## Getting Started:
1. **Choose Your Number:** Log into Telnyx Mission Control Portal, navigate to the Real time communications→Numbers→Buy numbers section, and select from our newly available country numbers. Learn more about it in this [hands-on demo.](https://support.telnyx.com/en/articles/4380325-search-and-buy-numbers)
2. **Set Up Outbound Routing:** Configure your calling preferences to maximize connectivity and efficiency.
3. **Start Calling:** Once you’ve assigned and configured your new numbers, you're ready to connect. Enjoy crystal-clear voice quality.

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


Telnyx expands 2-way voice coverage with new routes in Kuwait, Ukraine, and Russia

Telnyx has added local outbound voice capabilities in Kuwait, Ukraine, and Russia, bringing total 2-way voice coverage to 84 countries. See how to get started with local numbers and outbound calling.

We're continuing to grow where it counts. Telnyx has officially added local outbound voice capabilities in Kuwait, Ukraine, and Russia bringing our total coverage to 84 countries with 2-way voice. This update expands opportunities for businesses looking to build localized voice experiences across more markets without the complexity of managing multiple carriers or infrastructure partners.

Telnyx expands 2-way voice coverage with new routes in Kuwait, Ukraine, and Russia, bringing our total coverage to 84 countries

Telnyx now hosts Deepgram’s Flux model inside its global network, enabling sub-second conversational speech recognition. Running Flux at the edge removes public cloud hops, reducing latency for real-time AI voice agents.

**What’s new**

* **Flux integration:** Use Deepgram’s Conversational Speech Recognition model within Telnyx Voice AI.  
* **Edge deployment:** Model hosted in Telnyx PoPs alongside telephony and GPU inference layers.  
* **Low-latency processing:** Average end-of-turn detection in \~260 ms.  
* **Unified pipeline:** Handles both transcription and turn detection—no separate VAD setup.  
* **API access:** Available via Mission Control and Telnyx AI Assistants API.

**Why it matters**

* Reduces speech-to-response latency by 100–300 ms compared to cloud setups.  
* Improves barge-in detection for more natural conversations.  
* Simplifies configuration by consolidating transcription and endpoint logic.  
* Increases reliability by keeping audio within Telnyx’s private backbone.

**Example use cases**

* Real-time customer support agents with human-like timing.  
* Automated appointment scheduling and call routing.  
* Interactive voice assistants for logistics or healthcare.

**Getting started**

1. Log in to Mission Control → AI → Transcription Models.  
2. Select **Deepgram Flux** or set via API:

```json
"transcription": {
  "model": "deepgram/flux",
  "language": "en",
  "settings": {
    "eot_threshold": 0.7,
    "eot_timeout_ms": 5000
  }
}
```

3. Test live conversations through AI Assistants or the Voice AI API.

**Learn more** in our [developer documentation](https://developers.telnyx.com/api/inference/inference-embedding/create-new-assistant-public-assistants-post) or contact your Telnyx team.

Deepgram Flux is now hosted in Telnyx Voice AI. Run conversational speech recognition at the edge with ~260 ms end-of-turn detection.

Deepgram Flux Added to Telnyx Voice AI for Sub-Second Speech

Telnyx now hosts Deepgram’s Flux Conversational Speech Recognition model inside its global network. Running Flux at the edge eliminates public cloud hops, enabling sub-second transcription and faster AI responses. The model detects end-of-turns in ~260 ms, supports barge-in, and simplifies voice agent design with unified transcription and turn detection. Available now in Mission Control and the Telnyx Voice AI API.

Deepgram Flux now available in Telnyx Voice AI

We’ve simplified and accelerated speech recognition for [AI Assistants](https://telnyx.com/products/voice-ai-agents) by enabling native Azure Speech-to-Text (STT) support, no customer API key required.

The “azure/fast” configuration integrates Azure STT directly into the Telnyx AI stack, providing lightning-fast transcription with sub-200ms latency and exceptional accuracy across a wide range of languages and dialects.
Azure’s multilingual support makes it especially powerful for global users. For example, our tests show that Azure provides the highest-quality Arabic transcription currently available within the Telnyx platform.

## Why It Matters

This update removes integration friction and accelerates real-time voice AI performance.
By eliminating the need for API key management, developers can deploy enterprise-grade, multilingual voice AI assistants faster and more securely. Azure’s advanced transcription models also enhance accuracy in complex or accented speech, ensuring smoother, more natural interactions.

This improvement reinforces Telnyx’s position as the full-stack conversational AI platform,  delivering performance, flexibility, and global language reach from a single infrastructure.

## How to Get Started
You can start using Azure STT immediately in your AI Assistant configurations [in the portal](https://portal.telnyx.com):
1. In the AI Assistant settings, select the “azure/fast” Speech-to-Text engine. No API key or credential setup is required, Telnyx handles the integration.
2. Deploy your AI Assistant and experience real-time, high-quality transcription across supported languages.


Telnyx AI Assistants now natively support Azure Speech-to-Text (STT) without requiring customer API keys, delivering sub-200ms latency, high-quality transcription, and expanded language support.

Streamlined Azure STT Integration for AI Assistants, No API Key Needed

We’ve simplified and accelerated speech recognition for AI Assistants by enabling native Azure Speech-to-Text (STT) support, no customer API key required.

 Telnyx AI Assistants Now Support Azure STT Without Customer API Keys

See abandoned outbound traffic at a glance in the Mission Control Portal. This metric helps you spot problematic traffic quickly so you can reduce wasted spend and take corrective actions.

## What’s new
Abandoned calls chart shows the percentage of outbound calls dropped by the originator before the call is answered. Abandoned calls are outbound calls dropped by the originator before being answered

The chart is available now in the Mission Control Portal analytics dashboard for immediate inspection and is auto populated from your outbound call logs with no additional setup required.

Note, this is not available for managed accounts. 

## Why it matters
A single, visible abandoned percentage makes it faster to detect anomalies, prioritize investigations, and take corrective actions.

## How to get started
1. [Sign up](https://telnyx.com/sign-up) or [log in](https://portal.telnyx.com) to your Mission Control Portal account.
2. Open the analytics dashboard and locate the "abandoned calls" chart to view your account-level percentage.
3. No configuration required, the chart pulls from your existing outbound call logs.
4. To validate, generate outbound voice traffic and watch the chart update; contact customer support if you need help interpreting the data.


See percentage of abandoned outbound calls at a glance, spot problematic traffic, and take corrective actions. 


Track abandoned outbound calls in Telnyx Mission Control

See abandoned outbound traffic at a glance in the Mission Control Portal. This metric helps you spot problematic traffic quickly so you can reduce wasted spend and take corrective actions.

Abandoned outbound calls chart in now live in the Portal

## Overview

Telnyx NaturalHD voices now generate accurate Arabic speech directly from unvowelled script, improving pronunciation and rhythm without requiring tashkeel marks.

## What’s new

* **Automatic vowel inference:** Reads standard Arabic text without diacritics.  
* **Improved prosody:** Handles natural pauses and stress in Gulf Arabic.  
* **Voice set update:** `haqq`, `qadir`, `layla`, `shams`, and `sakina` now available for Arabic Voice AI agents.  
* **Backward compatibility:** Still accepts tashkeel input for explicit pronunciation control.

## Why it matters

* Produces clear, natural Arabic “out of the box.”  
* Reduces setup complexity for developers and IVR teams.  
* Ensures accurate names and numbers in live-call TTS.

## Example use cases

* Payment verification via voice prompts with accurate number reading.  
* Legal or religious content requiring strict pronunciation.  
* Voice assistants and IVRs tuned for Gulf Arabic users.

## Getting started

1. Choose any Arabic NaturalHD voice in the [Voice API](https://telnyx.com/products/voice-api) or the [Mission Control Portal](https://portal.telnyx.com/#/ai/assistants).  
2. Send Arabic text directly.  
3. Test pronunciation for your dialect before production.
2. Send Arabic text directly.  
3. Test pronunciation for your dialect before production.

Telnyx NaturalHD voices now support Arabic text without diacritics while still accepting tashkeel, enabling accurate, dialect-aware TTS for Gulf Arabic.

Arabic TTS with tashkeel support in Telnyx NaturalHD

Telnyx’s NaturalHD voices now generate Arabic speech directly from unvowelled script while still supporting explicit diacritics when needed. With new voices “haqq”, “qadir”, “layla”, “shams”, “sakina” tuned for Gulf Arabic, developers and IVR teams get accurate names, numbers and rhythms out of the box. 

Arabic TTS with tashkeel support in NaturalHD voices

A practical update for [Toll-Free Messaging](https://telnyx.com/products/toll-free-numbers) customers: we’ve added new business registration fields to the verification workflow. These changes help align with upcoming industry requirements and are available now in the [Mission Control Portal](https://portal.telnyx.com/) and [API](https://developers.telnyx.com/api/messaging/toll-free-verification/submit-verification-request).

## How it works
When submitting a toll-free verification request, you’ll see new input fields that capture your official business registration details (e.g. your business registration number, registration type, and issuing country). These fields can be filled out directly in the Mission Control Portal’s toll-free verification form or included as parameters in your API requests. 

For now, providing this information is optional and won’t affect current verification submissions. However, starting in January 2026 (exact date to be determined by carriers), these business registration fields will become mandatory for all new toll-free verifications. Requests missing the required fields at that time may be rejected by carriers.

![image (1).png](https://pleasant-sunrise-e14682326c.media.strapiapp.com/image_1_a1367dfc46.png)

![image (2).png](https://pleasant-sunrise-e14682326c.media.strapiapp.com/image_2_037b6135bd.png)

## Key benefits
- **Stronger compliance signals**: Adding business registration details gives carriers more confidence in your legitimacy, reducing back-and-forth and lowering scrutiny.

-** Faster approvals**: Clearer, verifiable info helps carriers process requests more efficiently, often leading to quicker turnaround times.

## Why this matters
This update helps future-proof your toll-free messaging as carrier requirements tighten in 2026. Adopting the new fields early keeps your communications running smoothly and avoids last-minute disruptions.

## Getting started
Toll-free messaging customers can start using the new fields today in the [Mission Control Portal](https://portal.telnyx.com/) or via the [API](https://developers.telnyx.com/api/messaging/toll-free-verification/submit-verification-request). Once submitted, Telnyx automatically includes this information in your verification; no other workflow changes are needed.

**New optional fields (mandatory from January 2026):**
- **Business Registration Number** (String): The official business registration number (e.g., Employer Identification Number (EIN) in the U.S.)
- **Business Registration Type** (String): The type of business registration being provided (e.g., EIN, Canada Revenue Agency (CRA), Companies House)
- **Business Registration Country** (String): The ISO 3166-1 alpha-2 country code of the issuing business authority

**Additional optional but encouraged fields:**
- **Doing Business As (DBA)** (String): DBA name of the business, if different from the legal name
- **Entity Type** (Enum): The business entity classification. Accepted values: SOLE_PROPRIETOR, PRIVATE_PROFIT, PUBLIC_PROFIT, NON_PROFIT, GOVERNMENT
- **Opt-in Confirmation Response** (String): Message sent to users confirming their opt-in to receive messages
- **Help Message Response** (String): The message returned when users text “HELP”
- **Privacy Policy URL** (String): URL pointing to the business’s privacy policy
- **Terms and Conditions URL** (String): URL pointing to the business’s terms and conditions
- **Age-Gated Content** (Boolean): Indicates if messaging content requires age gating (e.g., 18+). Accepted values: true, false. Default is false
- **Opt-in Keywords** (String): Keywords used to collect and process consumer opt-ins


Telnyx now supports new business registration fields in Toll-Free Verification. Submit stronger requests and stay ahead of 2026 carrier requirements.

New Business Fields for Toll-Free Verification | Telnyx

Telnyx has added new business registration fields to the Toll-Free Verification process via Portal and API. Get ahead of 2026 carrier requirements with stronger submissions.

Release notes