 This document explains what Exotel SIP Trunking is, how it works, and what problems it solves.  SIP (Session Initiation Protocol) Trunking allows you to make and receive phone calls over the internet instead of traditional telephone lines (PRI / ISDN).

Overview

 This guide helps you make your first outbound and inbound call using Exotel SIP Trunking.  By the end of this guide, you will Make outbound calls from your SIP system to PSTN Receive inbound calls from PSTN to your SIP system Create or use Exotel account https //my.

Exotel SIP Trunking – Quick Start

 Calls initiated from your SIP system to external phone numbers.  Call path Used for Agent outbound calling Dialers and campaigns Click-to-call from CRM Alerts and notifications Key requirements IP whitelisting (ACL) on the trunk Phone number mapped to trunk (Caller ID) Calls initiated from the telephone network to your SIP system.

Call Directions

 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) All APIs use HTTP Basic Authentication .

Detailed SIP Trunking API Reference

 This page explains exactly what needs to be configured on your firewall so your SIP system can Make outbound calls (SIP → PSTN) Receive inbound calls (PSTN → SIP) Important If calls connect but audio is missing or one-way, this port range is usually blocked.  Exotel connectivity has two independent paths Signaling – SIP INVITE / 100 Trying / 200 OK Media – RTP audio packets Both must be allowed for calls to work correctly.

Network & Firewall Configuration

 This table lists SIP response codes you may encounter , what they usually mean in real deployments, where the issue most likely lies , and what to check next .  These are the most common issues and do not always show SIP error codes .

SIP Error Codes & Troubleshooting Guide

 Exotel SIP Trunking connects your PBX, Contact Center, or Voice AI system to the telephone network over SIP.  It supports inbound, outbound, and bi-directional calling.

FAQs

 StreamKit enables you to connect your Contact Center to Voice AI bots.  The setup is similar to PSTN, but uses mode flow when mapping phone numbers.

StreamKit Cloud SIP trunking Setup

CCaaS

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