Documentation
Documentation · sipsandwich.ai
Connect your carrier or PBX to Retell AI
sipsandwich handles the signaling layer between your SIP infrastructure and Retell. Bring registration, SIP digest, or IP-authenticated carrier access.
Get started
Guides & walkthroughs
Quickstart
Getting started
The shortest path from a SIP carrier to a Retell agent. Choose your auth model, connect Retell, and test signaling.
Authentication
Carrier access
Understand IP authentication, registration, and SIP digest without SIP jargon. Collect the right credentials from your carrier.
Developer tools
Build with the API
API Reference
Browse schemas and test operations.
OpenAPI Spec
Download the raw specification.
Guided Setup
Configure via the onboarding wizard.
Signaling only
sipsandwich does not anchor RTP, transcode audio, record calls, or provide PBX features. Media flows directly between your provider and Retell according to your configuration.
Automate
Tenant API
Generate a tenant API token from Settings → Security → API access and send it as a bearer token to automate SIP trunk and phone number workflows.
bash
curl https://api.sipsandwich.ai/api/v1/sip/trunks \
-H "Authorization: Bearer $SIPSWICH_API_TOKEN"