3CX MyPhone allows you to quickly launch calls by double clicking on an extension or a missed call. It also integrates with Outlook (if you are using 3CX Phone System 10 and want CRM integration, …

3CX Phone System can be installed on most versions of Windows. Below is a complete list of supported and not supported operating systems. Note: Not supported does not necessarily mean that 3CX will not work …

Skills Covered by this Module

What is SIP
What is RTP
How calls are setup using SIP Message exchanges

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 …

Virtualization is becoming increasingly popular and 3CX fully supports this technology. 3CX itself runs its PBX on Hyper-V, however we also test our PBX on VMware. This guide explains how to configure a virtual instance …

The 3CX Phone System is designed to be multi-lingual. Each text element in the 3CX Management Console is stored in a file and referenced from this file.

By creating a localized copy of this file, it …

Location of Prompt Sets

All prompt sets are located within this folder:
Windows XP / 2003:
C:\Documents and Settings\All Users\Application Data\3CX\Ivr\Prompts\Sets
Windows Vista / 2008 / 7 / 2008:
C:\ProgramData\3CX\Data\Ivr\Prompts\Sets
Each prompt set has a separate subdirectory. So for example, the …

3CX Phone System can output call data records per call. These call data records can be configured to a format of your choice and thus its relatively easy to integrate with external billing software.
Adjusting Billing …

Introduction
DTMF (dual tone multi frequency) is the signal to the phone company that you generate when you press an ordinary telephone’s touch keys. In the United States, it’s known as a “Touchtone” phone. DTMF has …

This article explains the main fields included in a SIP INVITE, which is sent to set-up a VoIP call. A SIP INVITE message contains typically between 4 and 6 header entries with contact information inside …

All SIP Phone calls consist of 2 channels:

Messaging – SIP
Media – RTP

Messaging is carried using UDP or TCP (normally UDP) SIP packets – It is used for device registration, call setup/teardown, on-hold notification, call …

3CX administrators need to plan ahead on how to construct their 3CX Phone System. Now it is very time consuming to create 1 extension at a time for each user, with their settings and provisioning. …

Introduction to the 3CX Media Server
The 3CX Phone System’s main job is to connect 2 (or more) entities together for transmission of audio between them. However, there are 3 different mechanisms which can be utilized …

The 3CX Parameters table allows advanced options to be set. We do not recommend changing these options without having been requested to do so by support.
This is a list of the various additional settings …

When 3CX PhoneSystem needs to deliver email notifications, the SMTP mechanisms allowed can either be unauthenticated or authenticated using clear text.
Some SMTP servers may be configured to allow only TLS or SSL exchange. You can …

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.

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 …

This information is relevant for installations that that are NOT using the default US prompt set. Customers that do not use the default US prompt set need to take additional steps when performing an upgrade. …

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 …

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 …

What is a FoIP
FoIP – FAX over IP, is the technology used to allow faxing via the computer network. Because Fax is not ideally suited to travel via a normal phone call, the T38 protocol …

It is possible for a user to make an outbound call via the Voicemail menu.
Dial 999 -> Enter PIN -> Press 9 (for options) -> Press 3 (to dial an external number) -> Dial external …

Error 2738. Could not access VBScript run time for custom action.
This error usually appears on a system during some installations because Visual Basic Script (VBScript) is not installed or has been disabled. …

When is a call internal or external?
Calls are decided to be either local or external based on whether the contact IP of an inbound SIP packet is local or not. To check whether the IP …

3CX Phone System has a coded limit that controls the duration of a voicmeail message. This is set by default to 120 seconds. However in certain circumstances you may wish to change the 3CX Voicemail …