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Varun Singh
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examples/pcc-dialin-server/README.md
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examples/pcc-dialin-server/README.md
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# Handling PSTN/SIP Dial-in on Pipecat cloud
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This repository contains two server implementations for handling
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the pinless dialin workflow in pipecat cloud. This is the companion to the
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[pstn/sip pcc starter images](https://github.com/daily-co/pipecat-cloud-images/tree/vr000m-starter-image-dial-in-out/pipecat-starters/pstn_sip).
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In addition you can use `/api/dial` to trigger dial-out, and
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eventually, call-transfers.
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1. [Simple Python Server](simple-python/README.md) -
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A FastAPI implementation that handles PSTN (Public Switched Telephone
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Network) and SIP (Session Initiation Protocol) calls using the Daily API.
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2. [Vercel Serverless](vercel/readme.md) -
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A Next.js API implementation designed for deployment on Vercel's
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serverless platform.
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Both implementations provide:
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- HMAC signature validation for pinless webhook
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- Structured logging
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- Support for dialin and dialout settings
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- Voicemail detection and call transfer functionality (coming soon)
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- Test request handling
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## Choosing an Implementation
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- Use the **Simple Python Server** if you:
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- Need a standalone server
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- Prefer Python and FastAPI
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- Want to deploy to traditional hosting platforms
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- Use the **Vercel Serverless** implementation if you:
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- Want serverless deployment
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- Prefer JavaScript/TypeScript
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- Already use Vercel for other projects
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- Need quick scaling and zero maintenance
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## Prerequisites
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### Environment Variables
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Both implementations require similar environment variables:
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- `DAILY_API_KEY`: Your Daily API key
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- `AGENT_NAME`: Your Daily agent name
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- `PINLESS_HMAC_SECRET`: Your HMAC secret for request verification
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- `LOG_LEVEL`: (Optional) Logging level (defaults to 'info')
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See the individual README files in each implementation directory for
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specific setup instructions.
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### ### Phone number setup
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You can buy a phone number through the Pipecat Cloud Dashboard:
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1. Go to `Settings` > `Telephony`
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2. Follow the UI to purchase a phone number
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3. Configure the webhook URL to receive incoming calls
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Or purchase the number using Daily's
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[PhoneNumbers API](https://docs.daily.co/reference/rest-api/phone-numbers).
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```bash
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curl --request POST \
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--url https://api.daily.co/v1/domain-dialin-config \
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--header 'Authorization: Bearer $TOKEN' \
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--header 'Content-Type: application/json' \
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--data-raw '{
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"type": "pinless_dialin",
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"name_prefix": "Customer1",
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"phone_number": "+1PURCHASED_NUM",
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"room_creation_api": "https://example.com/api/dial",
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"hold_music_url": "https://example.com/static/ringtone.mp3",
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"timeout_config": {
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"message": "No agent is available right now"
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}
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}'
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```
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The API will return a static SIP URI (`sip_uri`) that can be called
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from other SIP services.
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### `room_creation_api`
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To make and receive calls currently you have to host a server that
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handles incoming calls. In the coming weeks, incoming calls will be
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directly handled within Daily and we will expose an endpoint similar
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to `{service}/start` that will manage this for you.
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In the meantime, the server described below serves as the webhook
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handler for the `room_creation_api`. Configure your pinless phone
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number or sip interconnect to the `ngrok` tunnel or
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the actual server URL, append `/api/dial` to the webhook URL.
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## Examples curl commands
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Note: Replace `http://localhost:3000` with your actual server URL and
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phone numbers with valid values for your use case.
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### Dialin Request
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The server will receive a request when a call is received from Daily.
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### Dialout Request
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Dial a number, will use any purchased number
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```bash
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curl -X POST http://localhost:3000/api/dial \
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-H "Content-Type: application/json" \
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-d '{
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"dialout_settings": [
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{
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"phoneNumber": "+1234567890",
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}
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]
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}'
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```
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Dial a number with callerId, which is the UUID of a purchased number.
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```bash
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curl -X POST http://localhost:3000/api/dial \
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-H "Content-Type: application/json" \
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-d '{
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"dialout_settings": [
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{
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"phoneNumber": "+1234567890",
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"callerId": "purchased_phone_uuid"
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}
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]
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}'
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```
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Dial a number
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```bash
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curl -X POST http://localhost:3000/api/dial \
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-H "Content-Type: application/json" \
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-d '{
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"dialout_settings": [
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{
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"phoneNumber": "+1234567890",
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"callerId": "purchased_phone_uuid"
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}
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]
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}'
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```
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### Advanced Request with Voicemail Detection
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```bash
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curl -X POST http://localhost:3000/api/dial \
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-H "Content-Type: application/json" \
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-d '{
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"To": "+1234567890",
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"From": "+1987654321",
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"callId": "call-uuid-123",
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"callDomain": "domain-uuid-456",
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"dialout_settings": [
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{
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"phoneNumber": "+1234567890",
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"callerId": "purchased_phone_uuid"
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}
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],
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"voicemail_detection": {
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"testInPrebuilt": true
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},
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"call_transfer": {
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"mode": "dialout",
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"speakSummary": true,
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"storeSummary": true,
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"operatorNumber": "+1234567890",
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"testInPrebuilt": true
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}
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}'
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```
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