Connecting an External Extension to 3CX PhoneSystem is often requested, and can be extremely useful for linking small remote offices and home workers. Here we get a shot at using other phones as External Extensions.

Using …

Upgrading firmware of Cisco phones from the 3CX Mgmnt Console

3CX Phone System Version 9 features the ability to easily upgrade your IP Phone’s firmware network wide. This is done using the Phone Provisioning node located in the “Settings” section. Pre-requisites

Download the latest firmware available for …

Using the recommended Firmware version is one of the keys for successful interoperability with 3CX PhoneSystem. From time to time, 3CX will release updates to the configuration guides that often include additional functionality that takes …

In this example we will demonstrate how to perform a blind and attended (consultative) transfer using a Cisco IP Phone SPA525G. We will assume that an incoming call will be received on the Cisco phone …

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 …

Cisco SPA Phones have the ability to look up for phone numbers and contacts in an Active Directory/LDAP. For this a template needs to be created and  the Cisco Phones need to be re-provisioned with …

Note: This guide has been tested with firmware version pos3.08.2.00. Be aware that different firmware revisions may have different functionality.
This document will describe how to get a Cisco 7940 with SCCP (Skinny) protocol, convert it …