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Posts Created by Kevin

External and Internal Devices: Network Topology

September 3, 2009 - 7:17 pm | 0 Comments

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.

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Is Microsoft ISA server 2004 / 2006 supported as a firewall for VOIP?

August 3, 2009 - 7:00 pm | 0 Comments

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 a VOIP provider or remote extensions. This is not a 3CX issue but an ISA server issue. The best solution is to buy a firewall such as from Linksys, Cisco, Netgear and others. Even

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Setting phones to use FQDNs instead of IP Addresses

July 16, 2009 - 1:37 pm | 0 Comments

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 it also affects your installation in case you wish to use FQDNs in the phone configuration. If you intend to address the PBX using IP Addresses only, and do not intend to use “Direct SIP”,

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Receiving a Fax using a VoIP Provider with 3CX

July 8, 2009 - 8:30 pm | 16 Comments

Please note that this information does NOT apply to V8. For V8, please go to this link: http://www.3cx.com/blog/releases/3cx-fax-update11344/ For those of you who have been dreaming about the possibility of receiving a Fax over a VoIP Provider account, with certain VoIP Providers it may be possible. 3CX has provided a patch for V7.1 which, while NOT being a guaranteed works-for-all solution, does improve interaction with VoIP Providers which support Fax

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

June 3, 2009 - 6:46 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) – Used

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DoS and Flood protection in Firewall Configuration

May 5, 2009 - 6:08 pm | 1 Comments

So you have installed 3CX PhoneSystem, your VoIP Provider account registers fine, a couple of test calls successfully prove that all is working. It’s now time to put things into production. And as soon as you have more than a couple of simultaneous calls, things stop working correctly!!! Calls do not come in, registrations fail, unexplained one-way-audio or no-audio behaviour – what gives?? Firewalls and NAT Devices today are always

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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

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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)

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3CX PhoneSystem Updated License Activation Module

April 17, 2009 - 9:05 pm | 11 Comments

As part of our routine Security Audit checks, we have updated the client and server components of the 3CX PhoneSystem license activation procedure. This means that activating your 3CX PhoneSystem requires the new version of the license activation module. This has been integrated inside the latest build (V 7.1.6589) which can be downloaded here: http://www.3cx.com/downloads/3CXPhoneSystem71.exe Please note that activation with earlier versions is no longer possible. Systems that need to

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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

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VIDEO: 3CX Tunnel – Configuration (Part 2)

February 23, 2009 - 9:48 pm | 0 Comments

This VoIP Nugget explains in detail how to setup the tunnel server side. It then shows how to setup the 3CX VoIP Phone to connect from anywhere on the internet to 3CX Phone System.

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VIDEO: 3CX Tunnel – Overview (part 1)

February 17, 2009 - 4:11 pm | 0 Comments

This VoIP Nugget explains what the 3CX Tunnel is – and why it makes configuring external extensions and bridges easier. A second VoIP Nugget will be published that shows exactly how to configure the 3CX Tunnel with the new 3CX VoIP Phone.

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3CX and Crisis Management

October 20, 2008 - 1:32 pm | 0 Comments

Crises cannot be avoided. That’s a fact. But there is a key to help any business sail successfully through a crisis: PREPAREDNESS. Unfortunately, crisis preparedness can be costly and complicated. Most businesses have some kind of system to back up their data. But how many have a system in place to backup their traditional proprietary PBX? If at all possible, how much would that cost?! And how many managers have

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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

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