Add Telnyx AI services integration example

examples/telnyx/README.md

@@ -0,0 +1,141 @@
+# Telnyx Integration for EchoKit Server
+
+This guide explains how to configure EchoKit Server to use Telnyx AI services.
+
+## Why Telnyx?
+
+Telnyx provides a comprehensive AI platform that integrates seamlessly with EchoKit:
+
+- **OpenAI-Compatible API**: All endpoints follow OpenAI specifications, enabling drop-in compatibility with EchoKit's architecture
+- **53+ AI Models**: Access to GPT-4, Claude, Llama, Mistral, and many open-source models through a single API
+- **Global Edge Network**: Low-latency inference from data centers worldwide
+- **Unified Billing**: Single API key for ASR, TTS, and LLM services
+- **Competitive Pricing**: Pay-per-use with transparent, per-token pricing
+
+## Prerequisites
+
+1. A Telnyx account ([sign up here](https://telnyx.com/sign-up))
+2. An API key from the [Telnyx Portal](https://portal.telnyx.com)
+
+## Quick Start
+
+### 1. Set Your API Key
+
+```bash
+export TELNYX_API_KEY="your-api-key-here"
+```
+
+### 2. Use the Example Configuration
+
+```bash
+cp examples/telnyx/config.toml config.toml
+```
+
+### 3. Build and Run
+
+```bash
+cargo build --release
+./target/release/echokit_server
+```
+
+## Configuration Reference
+
+### ASR (Speech Recognition)
+
+```toml
+[asr]
+platform = "openai"
+url = "https://api.telnyx.com/v2/ai/transcriptions"
+api_key = "${TELNYX_API_KEY}"
+model = "whisper-1"
+lang = "en"
+```
+
+Available models:
+- `whisper-1` - OpenAI Whisper (recommended)
+
+### TTS (Text-to-Speech)
+
+```toml
+[tts]
+platform = "openai"
+url = "https://api.telnyx.com/v2/ai/speech"
+model = "tts-1"
+api_key = "${TELNYX_API_KEY}"
+voice = "alloy"
+```
+
+Available voices:
+- `alloy`, `echo`, `fable`, `onyx`, `nova`, `shimmer`
+
+Available models:
+- `tts-1` - Optimized for speed
+- `tts-1-hd` - Higher quality audio
+
+### LLM (Language Model)
+
+```toml
+[llm]
+platform = "openai_chat"
+url = "https://api.telnyx.com/v2/ai/chat/completions"
+api_key = "${TELNYX_API_KEY}"
+model = "gpt-4o-mini"
+history = 5
+```
+
+Popular model options:
+- `gpt-4o` - Latest GPT-4 optimized
+- `gpt-4o-mini` - Fast, cost-effective
+- `claude-3-5-sonnet` - Anthropic Claude
+- `llama-3.1-70b-instruct` - Open-source alternative
+- `llama-3.1-8b-instruct` - Lightweight, fast inference
+
+See the [Telnyx AI documentation](https://developers.telnyx.com/docs/ai/introduction) for the complete model list.
+
+## Using Telnyx LiteLLM Proxy
+
+For advanced use cases, Telnyx offers a LiteLLM proxy that provides:
+
+- Automatic fallback between models
+- Load balancing across providers
+- Unified rate limiting
+- Custom model aliases
+
+Configure the proxy URL in your `config.toml`:
+
+```toml
+[llm]
+platform = "openai_chat"
+url = "https://api.telnyx.com/v2/ai/chat/completions"
+# Use any supported model
+model = "claude-3-5-sonnet"
+```
+
+## Troubleshooting
+
+### Authentication Errors
+
+Verify your API key is set correctly:
+
+```bash
+echo $TELNYX_API_KEY
+```
+
+### Model Not Found
+
+Check available models in your Telnyx Portal or consult the [API documentation](https://developers.telnyx.com/docs/ai/introduction).
+
+### High Latency
+
+Telnyx routes requests to the nearest edge location automatically. If you experience latency issues, verify your network connection or contact Telnyx support.
+
+## Additional Resources
+
+- [Telnyx AI Documentation](https://developers.telnyx.com/docs/ai/introduction)
+- [Telnyx API Reference](https://developers.telnyx.com/docs/api/v2/overview)
+- [EchoKit Documentation](https://echokit.dev/docs/quick-start/)
+- [Telnyx Discord Community](https://discord.gg/telnyx)
+
+## License
+
+This integration example is provided under the same license as EchoKit Server.

examples/telnyx/config.toml

@@ -0,0 +1,64 @@
+# EchoKit Server Configuration with Telnyx
+#
+# This example demonstrates using Telnyx AI services with EchoKit Server.
+# Telnyx offers 53 AI models via an OpenAI-compatible inference API,
+# making it a natural fit for EchoKit's OpenAI-spec architecture.
+#
+# Key benefits:
+# - Single API key for LLM, ASR, and TTS
+# - Global edge network for low-latency inference
+# - 53+ AI models including GPT, Claude, Llama, and open-source options
+# - Pay-per-use pricing with no minimum commitments
+#
+# Setup:
+# 1. Create a Telnyx account at https://telnyx.com
+# 2. Generate an API key from the Portal
+# 3. Set your TELNYX_API_KEY environment variable
+#
+# API Documentation: https://developers.telnyx.com
+
+addr = "0.0.0.0:8080"
+hello_wav = "hello.wav"
+
+[asr]
+platform = "openai"
+url = "https://api.telnyx.com/v2/ai/transcriptions"
+api_key = "${TELNYX_API_KEY}"
+model = "whisper-1"
+lang = "en"
+
+[tts]
+platform = "openai"
+url = "https://api.telnyx.com/v2/ai/speech"
+model = "tts-1"
+api_key = "${TELNYX_API_KEY}"
+voice = "alloy"
+
+[llm]
+platform = "openai_chat"
+url = "https://api.telnyx.com/v2/ai/chat/completions"
+api_key = "${TELNYX_API_KEY}"
+model = "gpt-4o-mini"
+history = 5
+
+[[llm.sys_prompts]]
+role = "system"
+content = """
+You are a helpful assistant. Answer truthfully and concisely. Always answer in English.
+
+- NEVER use bullet points
+- NEVER use tables
+- Answer in complete English sentences as if you are in a conversation.
+
+"""
+
+# Alternative: Use Telnyx's LiteLLM proxy for unified access to 53+ models
+# Uncomment the section below and comment out the [llm] section above
+#
+# [llm]
+# platform = "openai_chat"
+# url = "https://api.telnyx.com/v2/ai/chat/completions"
+# api_key = "${TELNYX_API_KEY}"
+# # Available models include: gpt-4o, claude-3-5-sonnet, llama-3.1-70b, and more
+# model = "llama-3.1-70b-instruct"
+# history = 5