• Releases

    3CX Product Releases

  • VoIP How To

    Technical tips to run your VoIP PBX more efficiently

  • Events

    3CX Trainings and Webinars around the world

  • Docs & FAQs

    3CX Documentation how to and FAQ

  • Phone configuration

    3CX, Aastra, Cisco, Yealink, Grandstream, Polycom configs

Docs and FAQ

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

May 3, 2009 - 6:53 pm | 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

......Read More »

How do I configure my Linksys router for 3CX Phone System?

May 3, 2009 - 6:30 pm | 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 and UDP)

......Read More »

How do I configure Patton ISDN VOIP Gateways for a Point-to-Point Connection?

April 3, 2009 - 7:47 pm | 0 Comments

This article applies to ISDN lines and ISDN gateways only. An ISDN line can either be point-to-point or point-to-multipoint. If you have a point-to-point connection, you can only attach one device to your ISDN line. If you have point-to-multipoint connection you can attach more than one device. You have to configure the ISDN lines connected to the Patton to be either point-to-point or point-to-multipoint depending on how your ISDN lines

......Read More »

What is QoS (Quality of Service)? A guide

April 3, 2009 - 6:25 pm | 0 Comments

In the VoIP / telecommunications  field, the term QoS (Quality of Service) refers to resource reservation control mechanisms. Quality of service is the ability to provide different priority to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow.  Quality of service guarantees are important for VoIP since VoIP is real time and requires fixed bit rate. QoS mechanisms are not required

......Read More »

Configuring 3CX Integration with Salesforce.com

April 1, 2009 - 10:33 pm | 0 Comments

If you are using 3CX Phone System 10, please visit the Salesforce CRM integration article, which can be found here. Introduction 3CX Assistant CRM Integration allows Salesforce.com users to automatically dial contacts simply by clicking ‘Call this contact’. The call will be triggered and setup to the users desktop phone WITHOUT having to actually dial the number on the phone. This saves users a great deal of time. Configuring outbound

......Read More »

How do I install the Microsoft Windows XP fax client?

March 12, 2009 - 7:16 pm | 0 Comments

Connecting to a Fax to print to Fax from a Windows XP Computer The scope of this article is to be able to send faxes to a shared printer. This shared printer can be any printer – hardware and software. However in relation to 3CX Phone System, the shared printer in this case would eventually be a computer/server with the 3CX Fax Sending module installed. The 3CX Fax Sending module

......Read More »

Error 2738 VBscript error during installation

March 9, 2009 - 10:22 pm | 0 Comments

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. Make sure VBScript is installed, turn off script blocking in anti-virus and personal firewall software, reregister VBScript, and then run the installation again. This guide will show how to register Visual Basic Script (VBScript) on your computer

......Read More »

Editing The Built-In Phone Provisioning Templates

March 2, 2009 - 5:02 pm | 0 Comments

3CX PhoneSystem is supplied with pre-configured templates for the most popular SIP Phone vendors on the market. These pre-configured templates include the settings which the majority of users need. Occasionally, however, it may be necessary to adjust the settings inside these templates to suit the needs of a particular installation. The 3CX Management Console provides a built-in editor to adjust these templates without the need to locate them inside the

......Read More »

How do I install Microsoft Fax services on Windows Server 2003

March 1, 2009 - 4:07 pm | 0 Comments

Note: The 3CX Fax Sending module is deprecated, and no longer supported. This article is for informational/historic purposes only. This guide is imporant to be able to enable Fax on Windows Server 2003 The Fax Sending module can then be installed on this machine and can be used to send faxes through Microsoft Fax Step1: Enable Windows Fax Go to Control Panel, Add Remove programs, Windows Components, and select Fax

......Read More »

How and when can I switch off STUN Resolution?

March 1, 2009 - 3:48 pm | 0 Comments

How and when can I switch off STUN Resolution STUN resolution is necessary for the PBX to understand what it’s public IP Address is, and what port mappings are in effect for Media (to attempt NAT traversal when port forwarding is not implemented). STUN resolution may be disabled when: No External entities are in use (no bridges, voip providers, extensions) AND/OR Static Port Forwarding is in place for reliable media

......Read More »

How do I install Microsoft Fax services on Windows Server 2008?

March 1, 2009 - 3:44 pm | 0 Comments

Note: The 3CX Fax Sending module is deprecated, and no longer supported. This article is for informational/historic purposes only. Windows Server 2008 needs to have the fax services role enabled to be able to use the 3CX Fax sending module to send faxes via Microsoft Fax. This document applies to Windows Server 2008, Server 2008 R2, SBS Server 2008 Access Server Manager. (Administrative tools) Go to Control Panel and click

......Read More »

What Call Progress Tones should I enter for my country?

March 1, 2009 - 1:42 pm | 0 Comments

Call Progress tones are audible tones used  by the public switched telephone network (PSTN) central office or a private branch exchange (PBX) to signal calling parties the status of phone calls. VoIP Gateways must understand these Call Progress Tones in order to detect a busy tone, dial tone or hangup correctly. Unfortunately these Call Progress Tones can vary per country, and in some cases you need to configure your VoIP

......Read More »

How to test a VoIP gateway

March 1, 2009 - 1:38 pm | 0 Comments

General Reset gateway to factory default and ensure you are running the latest firmware. Review vendor documentation and assign a IP / Subnet mask / default router or gateway / DNS entries to the device. Ensure you are documenting all this with notes and screenshots for eventual publication as an FAQ. Disable any automatic firmware upgrades to ensure the device remains on the tested firmware. Line Settings After having created

......Read More »

How do I install the Microsoft Windows Vista fax client?

February 24, 2009 - 6:07 pm | 0 Comments

System requirements for the clients: Windows Fax and Scan should be installed. Print Services should also be enabled. The Fax printer on the Server machine should be shared to network users. Network Users should be granted permission to be able to print on this Fax Printer. To install the client: Click on Start, Programs and click on ‘Windows Fax and Scan’. Select ‘Fax Accounts’ from the Tools menu. Click ‘Add’

......Read More »

How does 3CX Phone System decide whether a call is internal or external?

February 4, 2009 - 6:57 pm | 0 Comments

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 is local, 3CX Phone System uses the following process: It queries all IPs assignedto the PC on which it is installed. Using the subnet masks assigned, it checks whether the IP is local ACCORDING

......Read More »

How to change the maximum duration of a VoiceMail message

March 10, 2008 - 8:50 pm | 0 Comments

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 timeout from the default of 2 minutes (120 seconds) to something else. In this case we will show how we can change it to 5 minutes. This change can be achieved as follows: Step1: Navigate

......Read More »

Why do my Calls end after 3 hours?

March 4, 2008 - 6:54 pm | 0 Comments

This is done to prevent a scenario where a person makes a call somewhere and for some reason he forgets to hang up AND the gateway does not detect the hangup. This avoids unterminated calls going on for ever, and helps to avoid charges for such unterminated calls. This is a fail safe feature. The PBX is set to end calls every 10800 Seconds. This Value can be changed to

......Read More »

3CX PHONE SYSTEM

PRODUCTS

TECHNICAL INFORMATION

PRODUCT DOCUMENTATION

All Rights Reserved © 2012, 3CX

Switch to our mobile site