The whole point of provisioning phones is to eliminate the difficulties associated with manually configuring a large number of devices:

It is a tedious task
It can be very time consuming
Possibility of Human Error
Retaining a Standard Config …

If you have been asking yourself how to secure 3CX PhoneSystem, read on…

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 …

IMPORTANT This device has been tested for Voice using firmware version of “Wed Jun 10 11:53:59 2009”. The guide and template may not work for earlier or later versions of the firmware!
Configuration is a 2 …

Internet Service Providers typically rate their connectivity services based on download and upload bandwidth. So for example you may subscribe to an aDSL connection rated at 2 Mbps (Megabits per Second) download and 1 Mbps …

The 3CX Assistant is a useful tool that allows a user to better manage calls, and to collaborate with other users within the same group of Extensions.
3CX Assistant also includes some advanced functionality that can …

Note 1: This guide has been tested with version 3.0.4. Be aware that different version may have different interface formats and functionality Note 2: Not all providers allow calls over 3G. If …

In order for 3CX Phone System to communicate successfully with VoIP providers and Remote Extensions, your firewall/router device must be configured for SIP operation. To maximize your chances of success, make sure you choose a …

3CX is now providing additional free training Webcasts on more advanced topics, and the next one is scheduled for Thursday 25 March 2010 at 1500hrs (GMT+1).
This will be presented via Microsoft Live …

3CX provides monthly free training Webcasts, and the next one is scheduled for Thursday 11 March 2010 at 1500hrs (GMT+1).
This will be presented via Microsoft Live Meeting using its built-in VoIP …

Advanced Webcast on Phone Provisioning and 3CX Assistant 9 February 2010 at 1500hrs (GMT+1)

3CX provides monthly free training Webcasts, and the next one is scheduled for Thursday 11 February 2010 at 1500hrs (GMT+1).
This will be presented via Webex using its built-in VoIP for audio – so there …

3CX provides monthly free training Webcasts, and the next one is scheduled for Thursday 14 January 2010 at 1500hrs (GMT+1).
This will be presented via Webex using its built-in VoIP for audio – so there …

The VOIP Providers listed below are not directly available in the ‘Add VOIP’ section of the 3CX Phone System Web Interface, but are known to work with 3CX Phone System and tested by 3rd parties.

When configured correctly, you can use the Windows Time (W32Time) service as an SNTP/NTP server for both windows and non-windows SNTP/NTP clients.

3CX provides monthly free training Webcasts, and the next one is scheduled for Thursday 10 December 2009 at 1500hrs (GMT+1).
This will be presented via Webex using its built-in VoIP for audio – so there …

3CX provides monthly free training Webcasts, and the next one is scheduled for Thursday 26 November 2009 at 1500hrs (GMT+1).
This will be presented via Webex using its built-in VoIP for audio – so there …

The following is a complete list of ports that 3CX PhoneSystem uses in a default installation scenario:

How does direct SIP work?
The way direct SIP calls are initiated is very similar to the way sending an email works. A caller can call a callee from either a stand alone SIP phone which …

3CX provides monthly free training Webcasts, and the next one is scheduled for Thursday 12 November 2009 at 1500hrs (GMT+1).
This will be presented via Webex using its built-in VoIP for audio – so …

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 …

Click to download the stand-alone SIP Proxy Manager
What is the 3CX SIP Proxy manager
The SIP Proxy Tunnel can combine all SIP (signaling) and RTP (media) VoIP Packets from one location (typically a remote office) …

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 issues with Microsoft ISA server 2004 and 2006
Unlike most professional firewalls, Microsoft ISA server is not able to do static port mapping. Without static port mapping it is not possible to reliably connect to …

During set-up you are prompted to enter the FQDN of the phone system server OR the SIP domain. This SIP domain is used if you wish to use Direct SIP calls (more info here), but …