Correct Router Configuration is a key element in ensuring correct communications between 3CX PhoneSystem and external entities such as external extensions, VoIP Provider services, and other Bridged PBXs. NAT and/or PAT When a network host A sends a request to another network host B, it will be expecting a reply to the request. When both network hosts reside on a Public IP Address, the exchange is direct, and simple enough. If one of the network hosts resides on a Private IP Address, however, things start to be come more complex, because the network environment is a NAT/PAT environment. If network host A is in a NAT/PAT environment, when it sends a request to network host B, it will build its request using the only IP Address it knows – its private IP Address

If you have been asking yourself how to secure 3CX PhoneSystem, read on… 3CX PhoneSystem can receive call requests from the outside to the inside (Inbound Calls), or alternatively from the inside to the outside (Outbound calls). Inbound Calls can only have an internal entity as a destination with 3CX PhoneSystem. One of 2 exceptions is if you have a forwarding rule to send the call to an external number, but this would be an intentional setting on the extension’s forwarding rules.

In this article we will describe the configuration of a hardware router with a very attractive quality-price ratio. The Draytek 2820 is a ADSL 2/2+ Router/Firewall with advanced features such as the capability to establish 32 VPN connections, a robust object-based firewall, QoS Management, Bandwidth Management, and Dual-WAN cabilities.

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.

How to configure Secure SiP This is a complete guide that will provide detailed information on how to: 1. Setup 3CX Phone System with Secure SiP (TLS) (In this way the SiP messaging will be encrypted and therefore more secure) 2. Create certificates with Simple CA. 3. Use Microsoft’s inbuilt importer for trusted certificates and 4.

London, UK – February  17, 2010 -  Spitfire, the leading Internet Telephony Service Provider, has completed full Interoperability testing with 3CX and agreed to promote 3CX to Spitfire’s 200 strong partner channel. Spitfire has become a 3CX Supported SIP Trunk provider, with Spitfire SIP Trunk configuration built into the latest release of 3CX software, and support for Spitfire SIP Trunks being available from 3CX’s global technical support center. Spitfire presented 3CX to its partner channel in a joint seminar for Spitfire Partners at the end of January 2010, to promote the benefits of the 3CX IP phone system using Spitfire SIP trunks. In addition to this 3CX is holding two fully subscribed training days exclusively for Spitfire Partners at their training center in Kingston-upon-Thames. The 3CX phone system is a Windows based IP PBX that replaces a proprietary hardware PBX. 3CX’s IP phone system has been developed specifically for Microsoft Windows and is based on the SIP standard

This document describes how to fix and solve Internet Explorer Script Errors that come up in the 3CX Management Console every time one of the following actions is performed: Uploading an audio file to a Digital receptionist, Uploading an audio file to a Queue, Importing extensions using the Import Extension button When the above actions are performed It is common to see an error like the one below… This is caused by browser cached objects that are corrupted.  These need to be deleted. To do this: Click NO a number of times until the screen disappears Close the Browser and all sessions of the browser that you currently have open Go to Start / Control Panel / Internet Options Go to the section that says “Browsing History” and click on Delete Select All check boxes (Passwords check box is optional) and click delete. This will delete all cache from the browser. Access the 3CX Management Console and try and upload an audio file to a Digital receptionist.

This document describes how to resolve an issue when you try and access the 3CX Management Console or the 3CX MyPhone Portal and instead of getting the standard login screen, you see a blank white screen and “Done” on the lower left status bar of Internet Explorer browser window. This happens occasionally on Server 2008 operating systems with Internet Explorer as the default browser because the cache is corrupted. It can happen after the 3CX Wizard completes and launches the 3CX Management Console Login Screen. The above screenshot shows the problem – Here we can see that the management console login screen was not loaded properly. Resolution: To resolve this simply press the F5 key to refresh the page

Introduction 3CX Phone System frequently communicates across LANs and establishes calls between devices (softphones, hardphones, gateways, VoIP providers, and PBX bridges) which are located on different networks. The PBX communicates both with devices that are inside the PBX’s LAN (internal devices), as well as with devices that are outside the PBX’s LAN (external devices). 3CX needs to adjust the SIP packets depending on whether a device is external or internal. Since 3CX Phone System will need to communicate with external devices by crossing a NAT device, firewall configuration comes in to play as well, since this may affect packet routing. When is a device internal and when external? Since the composition of a SIP message for an internal device and that for an external device is different, the PBX must decide whether the device it is communicating with is internal or external, in oder to correctly interpret incoming SIP messages, and to correctly build outgoing SIP messages.

If you want to manage and configure 3CX Phone System on Windows 2008 server operating systems, you will have to disable IE ESC on the server. Go to Start and click on “Server Manager” Click on “Configure IE ESC” located on the right-hand section of the window. The Internet Enhanced Security Settings page will be displayed. Disable necessary options. IE ESC is now disabled