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ASP. signalwire. All did, which seems to indicate that there’s some issue with the SIP connection between Twilio and OpenAI. It can use a pipeline of STT, LLM, and TTS models, or a realtime speech-to-speech model. But very frequently (at least 10% of the time) the call doesn’t connect. Follow the instructions in this article to get started with the Realtime API via SIP. NET. com Redirecting It processes incoming audio from Asterisk SIP calls, sends it to OpenAI for processing, and streams the audio responses back to the caller seamlessly. The support for remote MCP Servers in the Realtime API — now generally available — is designed to let developers program May 30, 2025 · Hello everyone, Are there any VOIP enthusiasts or experts here? If so, we might have something to discuss. I’m integrating Twilio SIP with OpenAI Realti… 6 days ago · Hi everyone, We’ve been running an AI voice assistant in production using the Realtime API over SIP, with Twilio Elastic SIP Trunking pointing to: sip:proj_6ThBeJvaJTKbbGyke5l6Dzah@sip. Build world-class realtime AI apps with OpenAI and LiveKit Agents. 5 hours ago · Financial analysts say OpenAI is quickly burning through its money. NET application bridging a browser WebRTC client to OpenAI. Aug 28, 2025 · OpenAI's Realtime API is now generally available, featuring the new gpt-realtime model for more natural voice agents at a 20% lower cost for developers. Building safe and beneficial AGI is our mission. 6 days ago · For testing purposes, we disconnected the SIP trunk on Twilio and forwarded incoming calls to a local webhook URL instead, to see if they reached it. 4 days ago · We are also having issues with SIP. Nov 24, 2025 · Hello, Since this morning i’ve got no reply at all from OpenAI SIP endpoint. Here’s the flow: Asterisk sends INVITE to OpenAI. It’s Handling incoming calls When Azure OpenAI receives SIP traffic associated with your project, your webhook endpoint receives an incoming event message. The OpenAI Realtime API enables low-latency communication with models that natively support speech-to-speech interactions as well as multimodal inputs (audio, images, and text) and outputs (audio and text). I added a function call tool for hanging up, and while that gets invoked, I haven’t found a way to actually terminate the call. A cursor for use in pagination. 65. Nov 14, 2025 · Hi all, Since this morning, we’ve been facing a problem when starting a SIP call to OpenAI. incoming webhook for these attempts. The call is initiated when the caller dials my Twilio number, and Twilio creates an SIP connection with OpenAI. api. The call connects successfully, but I don’t get any audio back from OpenAI. i celebrate existing. learnlivekit. Options are pcm16, g711_ulaw, or g711_alaw. 172. I’m talking about the AI Voice Connector from OpenSIPS – the team has given the community a working bridge between VOIP and OpenAI Realtime API. Aug 28, 2025 · OpenAI, the maker of the ChatGPT, announced several new updates on Thursday for its artificial intelligence voice agents. With SIP and the Realtime API you can direct incoming phone calls to the API. A prominent financial analyst is warning that OpenAI, the 4 days ago · OpenAI gained between $65. For pcm16, input audio must be 16-bit PCM at a 24kHz sample rate, single channel (mono), and little-endian byte order. ” 🦔 🥂 OpenSIPS SIP Server – Back-to-Back server that handles the SIP processing AI Voice Connector – Handles the audio session with user as well as the interaction with the different AI engines Containers communicate efficiently over the Docker’s internal private network using MI commands and custom events. We explore the massive upgra The Unix timestamp (in seconds) of when the batch API request was completed. Sep 17, 2025 · In the Openai dashboard, we created a realtime prompt, saved it, and published it, so we now have the “prompt id. (such as ones from OpenAI and Gemini). Aug 28, 2025 · The Realtime API is officially out of beta and ready for your production voice agents! We’re also introducing gpt-realtime—our most advanced speech-to-speech model yet—plus new voices and API capabilities: 🔌 Remote MCPs 🖼 Image input 📞 SIP phone calling ♻ Reusable prompts gpt-realtime was trained with customers to excel at real-world tasks like support, personal assistance Sep 21, 2025 · Hi all, I’m testing an integration between Asterisk and OpenAI Realtime SIP API. We believe our research will eventually lead to artificial general intelligence, a system that can solve human-level problems. In this tutorial, I’ll show you the full AI call agent setup using Asterisk and OpenAI Realtime Jun 26, 2025 · By closely tracking OpenAI model releases and integrating them quickly, Retell can deliver new capabilities to customers within days. Potential uses include not just the obvious phone and call centre systems, but also collaboration and video systems. incoming like the example shown here. Testing it from the dashboard, everything worked fine. Build intelligent VoIP agents for call centers, insurance, medical support, and more. Sep 1, 2025 · Realtime SIP /refer always 400 (empty body) — /accept works Stack & Goal Env: Node. Result: A seamless, ongoing conversation with the AI. openai . com ending with “Last SIP Response: 408 Request Timeout” and duration 0s. Test order lookups, create tickets, and Oct 24, 2025 · The OpenAI Realtime API makes voice AI dead simple across WebRTC for browser apps, SIP for phone systems, and WebSockets for flexible integrations. 3 days ago · SAN FRANCISCO (AP) — OpenAI says it will soon start showing advertisements to ChatGPT users who aren’t paying for a premium version of the chatbot. js. So, I decided to build a replicable framework, something you can actually use without spending hours searching for missing pieces. Learn how to use webhooks and server-side controls with the Realtime API. The API now supports Session Initiation Protocol (SIP) integration, allowing voice agents to connect directly to phone networks and PBX systems. 接之前的文章： jinti：20天用RUST写一个SIP协议栈jinti：为什么应该用Rust重写FreeSwitch第一步完成了SIP stack可以工作之后，就开始测试这次最重要的一个功能：OpenAI + SIP 市面上主流的AI呼叫中心，都是基于Fr… Explore resources, tutorials, API docs, and dynamic examples to get the most out of OpenAI's developer platform. Over the past week, we’ve seen an increase in connection failures during specific, short windows (a few minutes at a time), though service typically recovers quickly afterward. Official SDK support: We will integrate support for Realtime API into the OpenAI Python and Node. 6X Learn how to connect OpenAI with VaxVoIP SIP Server SDK using C# or VB. i vibe. GetStartedSIP – demonstrates how to create a SIP-to-OpenAI WebRTC gateway that receives SIP (VoIP) calls and bridges to OpenAI. openai. Sep 23, 2025 · OpenAI's Realtime API brings human-quality voice AI to developers for $0. In this guide, I’ll walk through connecting Twilio’s Elastic SIP Trunking to OpenAI’s Realtime API using a Node. And to top it off OpenAI server is sending a Contact header without transport=tls and further optionally could use a sips:URI as per the SIP RFC (especially when the endpoint only supports Nov 22, 2024 · OpenAI Realtime API: Processes this incoming audio, generates a real-time response, and sends the audio back to Twilio over the same WebSocket. Sep 10, 2025 · Title: Example of Asterisk + OpenAI Realtime Call Assistant Category: API Tags: api, realtime, speech, asterisk Hi everyone 👋, I’m exploring how to build a real-time call assistant using Asterisk + OpenAI Realtime SIP API. Sep 1, 2025 · Summary: When establishing a SIP call using Asterisk with OpenAI’s Realtime API SIP endpoint, the call is prematurely terminated due to the SIP 200 OK response missing the required Content-Type: application/sdp header. Contribute to pheathtwilio/openai-sip-trunking development by creating an account on GitHub. - aicc2025/sip-to-ai Sep 5, 2025 · Hello hello good people, Adding custom headers to the SIP endpoint would help with a number of cases. Built with asyncio. Sep 15, 2025 · Demo code for OpenAI Realtime API SIP integration. SIP is the protocol used by most VoIP systems, PBXs, and carriers (like Twilio). Azure OpenAI GPT Realtime API for speech and audio is part of the GPT-4o model family that supports low-latency, "speech in, speech out" conversational interactions. 19 per call—99% cheaper than human agents—with companies like T-Mobile and Zillow already using it to transform customer service. You can use the Realtime API via WebRTC or WebSocket to send audio input to the model and receive audio responses in real time. ” Specifically, we also configured the functions and MCP Servers. Ensure that a SIP outbound trunk is configured before proceeding. 182. We receive no realtime. Contribute to akashjss/openai-sip development by creating an account on GitHub. webapp: NextJS app to serve as a frontend for call configuration and transcripts websocket-server: Express backend that handles connection from Twilio The official Java library for the OpenAI API. The artificial intelligence company said Fr… Sep 8, 2025 · Learn to connect the OpenAI Realtime SIP Connector with Twilio’s Programmable SIP to talk with an AI Agent and escalate to a human. Why’s this a big deal? Because SIP is a way to connect AI to many collaboration An example LiveKit app using SIP and DTMF to route calls between departments - ShayneP/phone-assistant A lightweight SIP-to-AI voice bridge connecting telephony calls to AI voice agents (OpenAI Realtime GA, Deepgram). By handling SIP communication and passing voice data to external AI models, OpenSIPS acts as a powerful middleware layer. When the call connects, the AI is fantastic. As mentioned, this issue is intermittent and completely unpredictable. Sep 15, 2025 · To connect the Realtime API with phone networks, OpenAI supports SIP (Session Initiation Protocol), the industry standard for initiating and managing voice calls. Contribute to openai/openai-java development by creating an account on GitHub. The event fired for sip calls is type = realtime. Learn how to build a cutting-edge AI contact center by seamlessly blending Azure Communication Services with the multi-agent intelligence of Azure OpenAI. As co-founder and CTO Zexia Zhang explains, “Because the models keep getting better, our platform keeps getting better. I’ve deployed AI call assistants for a few organizations, and realized how scattered and incomplete most resources are. The format of input audio. Personally, I went a step further and tried to implement function Aug 28, 2025 · SIP Transcription Solution: The Challenge I needed to implement real-time voice transcription for SIP calls using OpenAI’s Realtime API. Oct 10, 2025 · Hello, reporting a few issues with the SIP APIs. Here is an example of a SIP call that generates this error, captured on Asterisk: Reliably Transmitting (NAT) to 1XX. ' OpenAI Realtime SIP Integration This guide will walk you through integrating Bandwidth's Voice Network with OpenAI's Realtime SIP Interface. com) Proxy: Kamailio (creates SIP B-leg to OpenAI) Monitoring: Voice API server monitors via WebSocket Flow: Caller → Kamailio → OpenAI SIP → AI Screening → REFER transfer to user’s phone Aug 29, 2025 · Enterprise-Grade Features OpenAI has clearly prioritized production deployment with several new capabilities. Oct 3, 2025 · Architecture Overview SIP Provider: SignalWire (example-domain. Is project SIP gated per project? API realtime 1 184 September 18, 2025 Receiving SIP 400 Bad Request when sending an INVITE from Twilio to OpenAI Bugs api-realtime 5 85 January 8, 2026 No response for SIP INVITE Bugs sip 3 70 November 24, 2025 3 days ago · We’re also using the SIP calling integration to automate phone-based customer support in Japan. I’m building an app where a number of refers take place, and the only way to keep track of the calls throughout is a workaround. NET Get Started – ASP. Grab the code examples below to spin up working prototypes in hours, not weeks. However, you’ll most likely want tool use and other business logic to reside on your application server to keep this logic private and client-agnostic. (Please use headphones for testing, using speakers will constantly interrupt communication. These APIs can also be used for realtime audio transcription. For browser-based speech-to-speech voice applications, we recommend starting with the Agents SDK for TypeScript, which provides higher-level helpers and APIs for managing Realtime sessions. The GPT Realtime API is designed to handle real-time, low-latency conversational interactions. AI Voice Connector - Community Edition This project leverages OpenSIPS as a SIP gateway, creating a seamless interface between traditional SIP-based communication systems and advanced AI engines. js SDKs. after is an object ID that defines your place in the list. OpenAI SIP Voice Agent registers as a SIP endpoint via PJSIP, bridges audio between your PBX and OpenAI’s realtime or legacy voice APIs, and streams responses back to callers without leaving your telephony domain. For instance, if you make a list request and receive 100 objects, ending with obj_foo, your subsequent call can include after=obj_foo in order to fetch the next page of the list. I am trying to use the classes in the agents SDK but I cannot get the agent to use function tools. js (Express on EC2), SIP trunk (Twilio Programmable Voice), OpenAI Realtime via SIP Goal: Transfer an active call mid-session using… Nov 26, 2025 · Introduction Voice technology is transforming how we interact with machines, making conversations with AI feel more natural than ever before. The new functionality provides a way to call an AI assistant or have it join a meeting as a live participant. OpenA… Sep 15, 2025 · Twilio Call Insights shows the SIP leg to sip. js/TypeScript server to respond to webhooks, and build an AI support agent that answers inbound calls, understands customer issues, and responds instantly. … Aug 29, 2025 · OpenAI has added remote model context protocol (MCP) Server and session initiation protocol (SIP) support to its speech-to-text large language model gpt-realtime via its dedicated API to help enterprises build more autonomous voice-based agents. Th. Please read the API docs before posting. Aug 29, 2025 · OpenAI has added remote model context protocol (MCP) Server and session initiation protocol (SIP) support to its speech-to-text large language model gpt-realtime via its dedicated API to help Sep 2, 2025 · OpenAI has added a native SIP interface to its Realtime Voice API. This guide helps you design and build a voice agent. ) between send and receive answers making felling the conversation more fluid and natural. ) 🚀 Big news in AI + communications: OpenAI just added a native SIP interface to their realtime voice API. Prompt Caching: We will add support for Prompt Caching ⁠ (opens in a new window) so previous conversation turns can be reprocessed at a discount. Sep 11, 2025 · In other words, today the supported Azure path is PSTN/SIP → ACS → Realtime (WebRTC/WS), not SIP directly into an Azure OpenAI resource. com;transport=tls Everything was working fine in production until Saturday, at which point we started seeing two issues: Sporadic dropped calls right at dial start Symptom: the caller dials our 3 days ago · Twilio to OpenAI SIP returns 408. Aug 29, 2025 · 'OpenAI released GPT-Realtime and Realtime API with unified audio processing, SIP phone support and MCP server integration, improving performance and enterprise deployment options while key speech AI challenges remain. 5 days ago · We are also having issues with SIP. @Sean-Der is there something wrong with SIP Endpoint ? Or maybe my server is banned for unkown reasons ? Thanks, Ed Production-ready starter kit for building low-latency AI voice agents with OpenAI Realtime API. Jan 6, 2026 · OpenAI Says Scaling Laws Are Dead Then Bets $500 Billion on More Scaling November 14, 2025, Chris Malone spotted the contradiction nobody else mentioned. Now, it’s fully possible to call your bot using any SIP-compatible PBX. Imagine an attended transfer scenario, the refer goes to a parking slot, and if the transfer is refused, it has to be picked up, with context and continuity in the Aug 30, 2025 · はじめに 先日OpenAIのYoutubeを見ていたらRealtime APIのアップデートが色々流れていました。 その中で、これまではWebSocketでしか対応していなかったところから、SIP接続に対応したということで、早速マニュアルをみながらセットアップしました。実 Connect with other developers building with the OpenAI API Platform. 3 billion and $25. We then connected the PBX via SIP to the realtime API and configured the call acceptance software as shown in the example. Could you please investigate whether any recent changes or updates on the OpenAI side might be contributing to these 20 hours ago · Question Has anyone experienced intermittent SIP 400 errors when connecting Twilio SIP Trunks to third-party SIP endpoints (or OpenAI specifically)? Could this be related to SIP header validation, SDP / codec negotiation, or Twilio routing changes? Are there known cases where SIP endpoints intermittently reject calls without configuration changes? REST endpoints for controlling WebRTC or SIP calls with the Realtime API. On these occasions, the phone doesn’t Azure OpenAI GPT Realtime API for speech and audio is part of the GPT-4o model family that supports low-latency, "speech in, speech out" conversational interactions. We have an Asterisk server that receives calls from a provider and forwards them to OpenAI. Contribute to solenopsys/openai-gate development by creating an account on GitHub. With the public GetStartedDI – illustrates using the library with . Learn how to build agents and workflows with OpenAI and AgentKit. call. api. 5 days ago · Frank 🦔 whispers (very smol voice): “teeny hedgehog… big sip vibes 🥹 🍋🍸 sip 🍾 bloop bubble i sit. Aug 31, 2025 · Does anyone know, or has anyone got a call working, with the new realtime SIP endpoint where the SIP client is behind a NAT? In my experiements with a SIP client on my local machine the signalling looks good and I get an OK response to the INVITE after doing the webhook dance but then no audio arrives. The OpenAI Realtime API supports connecting to realtime models through a WebRTC peer connection. pls no spill on me. 1 billion, Musk said in the federal court filing ahead of his trial against the two companies 20 hours ago · In this video, we dive deep into OpenAI’s newly released GPT Realtime API, which is now production-ready (General Availability). com No matter if it’s a SIP Options (ping) to monitor the endpoint or directly SIP INVITE. SIP is a protocol used to make phone calls over the internet. 4 billion from the billionaire entrepreneur's contributions when he was co-founding OpenAI from 2015, while Microsoft gained between $13. Mobile uploads OpenAI dilaporkan sedang mengalami kerugian besar dengan proyeksi kerugian mencapai sekitar $14 miliar pada 2026 setelah kerugian $8 miliar di 2025, akibat biaya inferensi AI dan pembangunan data center yang membengkak meskipun pendapatan miliaran dolar dari pengguna ChatGPT. The SIP connection is OK, audio is Use the OpenAI API and Agents SDK to create powerful, context-aware voice agents for applications like customer support and language tutoring. Looks like the Open AI SIP servers require some level of TLS signalling but reject RTP encryption leaving us with unencrypted audio over the open internet. Everything started around 8 AM GMT. 5 days ago · Hi there, I was just wondering what is the state of the Agents Python SDK. Questions, feedback, and best practices around building with OpenAI’s API. 5 billion and $109. The webhooks never arriving also an on-and-off issue for us. Unlike traditional voice processing pipelines, this system processes and generates audio directly without the complex chain of speech-to-text-to-speech conversion. I’ve tried changing my /answer payload to be as simple as possible incase there was an issue with this: { “type”: “realtime”, “model”: “gpt-realtime”, “instructions”: “You are Fred, a friendly concierge for the day. Apr 26, 2025 · I had been working in a ARI app for pure Asterisk 20 that connects calls from extensions and Sip Trunks to OpenAI RealTime models, that reduce substancially the latency (to 1 sec aprox. We are connecting via our Asterisk server, and right now we are experiencing “No session found for provided call_id”. Accept or reject an incoming call, transfer it to another destination, or hang up the call once you are finished. It seems that the SDP cannot be established correctly. You can use the Realtime API via WebRTC, SIP, or WebSocket to send audio input to the model and receive audio responses in real time. Sep 12, 2025 · The Realtime API allows clients to connect directly to the API server via WebRTC or SIP. This integration allows you to leverage OpenAI's advanced AI capabilities in your call flows. Aug 28, 2025 · OpenAI's GPT-realtime is a revolutionary speech-to-speech model delivered through the Realtime API. The IP address in my INVITE SDP is private and I suspect that could be the issue. This bridges the gap between digital AI and traditional telephony infrastructure. Sep 7, 2025 · API api-costs , realtime 13 1188 April 14, 2025 Realtime API using SIP - Call dropping after 1 second - BYE from OpenAI API realtime 2 235 October 15, 2025 Not able to connect to realtime server side websocket using call_id API 4 620 November 19, 2025 Certain session properties result in the call turning to static with gpt-realtime and SIP Bugs Oct 15, 2025 · Hi, I’m building a PoC using Twilio trunks but experiencing calls dropping after 1 second. The main challenge was getting caller speech transcribed and saved properly while maintaining a stable SIP connection for voice calls. Aug 28, 2025 · We’re releasing a more advanced speech-to-speech model and new API capabilities including MCP server support, image input, and SIP phone calling support. OpenAI’s Head of Data Centers told an … Learn how to manage Realtime speech-to-speech conversations. This example builds on concepts from the Outbound Calls section of the docs. If Microsoft exposes direct SIP entry, it will appear in the Realtime guides or Azure AI Foundry portal. A prominent It uses LiveKit SIP and Python Agents Framework. Includes FastAPI server, WebRTC client, and MCP-style tools. NET Dependency Injection. This repo implements a phone calling assistant with the Realtime API and Twilio, and had two main parts: the webapp, and the websocket-server. I found some older posts about ending calls Nov 26, 2024 · Fully compliant with SIP industry standards, the Vodia phone system integrates effortlessly with a wide range of SIP-based devices and trunking providers, granting ultimate freedom in telephony. The company reportedly burned through over $8 billion in 2025 alone. Open AI SIP and WebRTC gate. 150 sip. Complete reference documentation for the OpenAI API, including examples and code snippets for our endpoints in Python, cURL, and Node. Oct 1, 2024 · We will increase these limits over time to support larger deployments. cheers. Connect with other developers building with the OpenAI API Platform. Nov 14, 2025 · I’ve built a AI voice assistant using the Realtime API and connected it with a caller using an SIP connection with Twilio. Does anyone have a working example or guide that covers the full flow? Specifically: Asterisk configuration Python implementation Step-by-step guide / best practices Learn how to use OpenAI realtime models and prompting effectively. ” } Checks I’ve carried out: Twilio trunks are configured to Aug 30, 2025 · Problem and Question After experimenting with OpenAI’s new GPT Realtime SIP feature (GA as of a day or two ago), I ran into a situation where I wanted to allow the agent to end the call after it said goodbye.

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