---
title: Detailed SIP Trunking API Reference
slug: dynamic-sip-trunking/detailed-sip-trunking-api-reference
docTags: 
createdAt: 2026-01-24T09:23:36.612Z
---

This section documents the APIs required to configure and manage **SIP Trunking** with Exotel.

Use these APIs to:

- Make outbound calls to the PSTN
- Receive inbound calls on your SIP system
- Integrate SIP with Exotel Flows and Voice AI (StreamKit)

## Base URL & Authentication

All APIs use **HTTP Basic Authentication**.

### Base URLs

| **Region**     | **Base URL**               |
| -------------- | -------------------------- |
| India (Mumbai) | https\://api.in.exotel.com |
| Singapore      | https\://api.exotel.com    |

All endpoints are prefixed with:

/v2/accounts/\{account\_sid}

### Required Headers

Authorization: Basic \<api\_key\:api\_token>

Content-Type: application/json

### Rate Limits

| Limit Type          | Value |
| ------------------- | ----- |
| Requests per minute | 200   |

## API Workflow Overview

Typical PSTN setup follows this order:

→ Create Trunk

→ Map Phone Number

→ Map ACL (Outbound) or Create Credentials(Digest Auth) for trunk(outbound)

→ Map Destination URI (Inbound)

# GETTING STARTED (PSTN Setup)

This section covers the APIs required to set up SIP Trunking for standard PSTN (telephone network) connectivity.

[Postman Collection](https://www.postman.com/grey-star-272776/exotel-sip-trunking-apis/collection/14803574-a0c66128-0e2c-4e6d-a06a-03173b9d43cd)

[Github Repo](https://github.com/exotel/exotel-vsip-trunk-Configuration-API/tree/main)

**Setup Flow:**

:::BlockQuote
Create Trunk → 2. Map Phone Number → 3. Map ACL (for Outbound) → 4. Map Destination URI (for Inbound)
:::