# Telnyx SIP Trunking

> Carrier-owned SIP trunking with global reach and STIR/SHAKEN A-level
> attestation. Outbound, inbound, and elastic trunks. Base URL:
> https://api.telnyx.com/v2

## What this surface is for
- Outbound and inbound SIP termination on a Tier-1 carrier network
- Elastic and FQDN trunks for direct-to-IP origination
- Per-second billing, no per-channel fees
- Number provisioning bundled with trunk configuration

## Pricing (headline rates)
- Outbound from $0.005/min
- Inbound from $0.0035/min
- No per-channel or concurrent-call fees
- Full pricing markdown: https://telnyx.com/pricing.md
- Pricing JSON: https://telnyx.com/ai/pricing.json

## Canonical docs and specs
- SIP trunking API reference: https://developers.telnyx.com/api/sip-trunking
- Outbound voice profiles: https://developers.telnyx.com/docs/voice/sip-trunking
- OpenAPI discovery: https://telnyx.com/.well-known/openapi.json
- API catalog: https://telnyx.com/.well-known/api-catalog

## Capabilities and structural claims
- Capabilities index: https://telnyx.com/ai/capabilities.json
- Carrier-owned: true (verify with `npx @telnyx/benchmark --scenario sip-trunking`)
- Inter-provider hops: 0 on Telnyx-owned routes
- STIR/SHAKEN attestation level: A
- Compliance: https://telnyx.com/ai/compliance.json

## Authentication
- Bearer API key in the Authorization header.
- Get a key via the agent signup flow: https://telnyx.com/agent-signup.md
- OAuth 2.0 metadata: https://telnyx.com/.well-known/oauth-authorization-server

## Agent fast path
- Agent entry point: https://telnyx.com/agents/start
- Site-wide index: https://telnyx.com/llms.txt
- Getting started for agents: https://telnyx.com/getting-started.md