Quality and affordable VoIP PBX solution available to all 3CX Phone System customers thanks to successful integration testing with leading VoIP provider, ippi.
London, UK and Paris, France – 26 January 2012 – 3CX, developer of …

Configuring DID with a VOIP Provider
In some cases when you have a VoIP Provider with DID/DDI, you might encounter a situation when the VoIP Provider will not allow a call to go through. In the …

Skills Covered by this Module

What is VoIP Provider Account
What types of VoIP Provider accounts can be connected to 3CX PhoneSystem
About Unsupported VoIP Providers which do not have a plug-and-play template
Firewall considerations for connecting VoIP Providers …

It is not possible to use Grandstream 4004/4008/4024 as an ATA for a fax machine and send faxes through a VoIP provider, unless the VoIP Provider includes support for delivering T38 traffic to the Public …

Configuring Outbound Rules on 3CX PhoneSystem is a very simple affair if you have a single device or service which you deliver calls with – in most cases a single rule will be enough.
But the …

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 …

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 …

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 …

Although we recommend the use of supported VoIP Providers, in some cases it may be necessary to use an unsupported VoIP Provider.
3rd Party Supported VoIP Providers
3rd Party supported VoIP providers have been tested by the …

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.

Note 1: The results generated from these tests should remain valid while the VoIP Provider keeps your account settings static. If your VoIP Provider account is reconfigured, it may be necessary to redo these …

Once you decide to break your company free from a traditional phone system, one of things that make adopting IP Telephony attractive is the ability to use a VoIP provider to save on phone call …

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 …

How can I adjust the configuration for unsupported VOIP providers or gateways?
3CX performs extended tests with a number of VoIP Providers and Gateways. This allows us to create optimized templates for use with these tested …

The source of a call must be identified for security. This FAQ explains how 3CX Phone System identifies the source of calls by default and how you can adjust the default to make it work …

Whilst 3CX includes a good number of supported VoIP providers, it is impossible for us to template all the VoIP providers out there and to test them.  If you have a VoIP provider you would …

STUN stands for Simple Traversal of User Datagram Protocol (UDP) through Network Address Translators (NAT’s). It is used in several different network implementations and scenarios, one of which is VoIP. Because of the way protocols …