Stun Module

Razvan Pistolea

Edited by

Razvan Pistolea

Revision History
Revision $Revision:$$Date:$

Table of Contents

1. Admin Guide
1.1. Overview
1.1.1. The idea
1.1.2. Basic Operation
1.1.3. Supported STUN Attributes
1.2. Dependencies
1.2.1. OpenSIPS Modules
1.2.2. External Libraries or Applications
1.3. Exported Parameters
1.3.1. primary_ip (str)
1.3.2. primary_port (str)
1.3.3. alternate_ip (str)
1.3.4. alternate_port (str)
1.4. Exported MI Functions

List of Examples

1.1. Set primary_ip parameter
1.2. Set primary_port parameter
1.3. Set alternate_ip parameter
1.4. Set alternate_port parameter

Chapter 1. Admin Guide

1.1. Overview

1.1.1.  The idea

A stun server working with the same port as SIP (5060) in order to gain accurate information. The benefit would be an exact external address in the case of NATs translating differently when given different destination ports.

1.1.2.  Basic Operation

The stun server will use 4 sockets:

  • socket1 = ip1 : port1
  • socket2 = ip1 : port2
  • socket3 = ip2 : port1
  • socket4 = ip2 : port2

The sockets come from existing SIP sockets or are created.

Socket1 must allways be a SIP UDP listener from OpenSIPS.

The server will create a separate process. This process will listen for data on created sockets. The server will register a callback function to SIP. This function is called when a specific (stun)header is found.

1.1.3.  Supported STUN Attributes

This stun implements RFC3489 (and XOR_MAPPED_ADDRESS from RFC5389)


Not supported attributes:


and associated ERROR_CODEs

1.2. Dependencies

1.2.1. OpenSIPS Modules

The following modules must be loaded before this module:


1.2.2. External Libraries or Applications

The following libraries or applications must be installed before running OpenSIPS with this module loaded:

  • None.

1.3. Exported Parameters

1.3.1.  primary_ip (str)

The ip of the an interface configured as UDP SIP listener in OpenSIPS. It is a mandatory paramter, by default empty.

Example 1.1. Set primary_ip parameter


1.3.2.  primary_port (str)

The port configured (together with the primary_ip) as an UDP SIP listener in OpenSIPS. It is a mandatory paramter, by default 5060.

Example 1.2. Set primary_port parameter


1.3.3.  alternate_ip (str)

Another ip from another interface. It is mandatory to be set, default is empty (not set).

Example 1.3. Set alternate_ip parameter


1.3.4.  alternate_port (str)

Another port used by STUN. It is mandatory to be set, default value is 3478 (default STUN port).

Example 1.4. Set alternate_port parameter


1.4. Exported MI Functions