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NAT

¿Por qué 3CX requiere mapeo de puertos estático (NAT de tipo Full Cone)?

July 19, 2010 - 6:18 pm | 2 Comments

Si está utilizando un proveedor VOIP, necesitará un firewall que soporte y esté configurado para utilizar mapeo de puertos estático. El mapeo de puertos estatico es requerido por RTP, el protocolo que lleva el audio, para que funcione correctamente. RTP y NAT Simétrico Las aplicaciones VOIP utilizan el protocolo RTP para enviar y recibir audio y video, y suelen tener problemas al encontrarse detrás de un firewall o ruteador dado

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Información general de configuración al utilizar proveedores de VoIP

May 11, 2010 - 3:30 pm | 0 Comments

Este documento les dara una introducción a los conceptos más comunes que necesitan ser tenidos en mente a la hora de configurar 3CX PhoneSystem en su infraestructura de red, incluyendo los siguientes temas: Configuración NAT Resolución STUN Resolución de DNS en un ambiente VoIP Configuraciones especiales para diseños de red particulares Diferentes tipos de cuentas de proveedores de VoIP Identificación de la fuente en el intercambio de mensajes SIP con el proveedor VoIP

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General Configuration Information when using VoIP Providers

May 3, 2010 - 7:20 am | 0 Comments

This document will provide an overview of the more common concepts which need to be kept in mind when configuring 3CX PhoneSystem inside your network infrastructure, including the following topics: NAT Configuration STUN Resolution DNS Resolution in a VoIP environment Custom Configuration for particular network layouts Different types of VoIP Provider Accounts Custom Source Identification for VoIP Provider SIP message exchange NAT Configuration Number one on the VoIP provider configuration check list is the Port forwarding (also known as port publishing) on your NAT device. If your PBX is operating from an average network i.e.

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Configuring AVM FritzBox as a Firewall with 3CX Phone System

April 14, 2010 - 8:28 am | 0 Comments

This guide will show how to configure an AVM Fritzbox router / firewall as a border device with 3CX Phone System in the LAN. The tests were made using a FritzBox 7170 with firmware version 29.04.76

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What is the firewall checker and why do I need it?

October 3, 2009 - 12:11 pm | 0 Comments

Introduction The 3CX Firewall Checker checks whether the ports needed to communicate with your VOIP provider are open and properly configured with STATIC Port mapping. If the firewall checker does not complete successfully, you will not be able to make or receive calls from a VoIP provider or external extension. Common symptoms that are linked to incorrect firewall configurations are: No registrations One-way audio Stun Problems, or incorrect resolution The firewall checker can be run from “Settings-> Firewall Checker” page. Interpreting the test results If your firewall check results contains errors or warnings, you have a problem that you will need to address.

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How do I configure a CISCO router to allow connection to a VOIP provider?

June 3, 2009 - 11:46 am | 0 Comments

If you are using a VOIP provider , then you will have to configure your firewall correctly in order to get reliable results. Your firewall must support STATIC PORT MAPPING. 3CX Phone System needs the following ports mapped on the router or firewall to operate properly: Port 5060 (TCP and UDP) – Used for SIP protocol transmission – must be a static mapping, no port translation Port 5090 (TCP) – Used for 3CX tunnel (if tunnel is enabled) Port 9000-9015 (UDP) – Used for RTP protocol for incoming and outgoing calls For business grade results you will also need a static/dedicated IP. Note that many cheap routers do not correctly port forward, and this will lead to problems when making calls

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Why does 3CX require static port mappings (Full Cone NAT)?

May 3, 2009 - 11:53 am | 0 Comments

If you are using a VOIP provider, you will need to have a firewall that supports and is configured to use static port mapping. Static port mapping is required for RTP, the protocol that carries audio, to be able to function correctly. RTP and Symmetric NAT VOIP applications use the RTP protocol to send and receive audio and video streams, tend to have problems behind a firewall or a router since RTP uses random ports to send and receive audio or video streams. Incorrect firewall configuration will cause calls made via a VOIP providers or to remote extensions to have no audio or one way audio only. When using Symmetric NAT, the firewall/router will change the port on which the audio is received, on the fly.

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