What VOIP Providers have you tested 3CX Phone System with?

3CX Phone System for Windows supports numerous VOIP providers that we have tested and have partnership with, and many that have been tested by our community.

General 3CX Phone System FAQs 

• What phones, gateways and firmware have you tested 3CX Phone System V5.1 with?
• How can I setup integration between 3CX and Salesforce.com?
• How can I view SIP traffic with a Network Capture tool?
• Is Microsoft ISA server supported as a firewall?
• How do I configure a CISCO router for to allow connection to a VOIP provider?
• Why does 3CX require static port mappings (Full Cone NAT)?
• What is overlap dialing?
• How do I update a Patton Smartnode to the latest firmware?
• What operating systems does 3CX Phone System support?
• How do I Connect A SmartNode to the Network and import the configuration?
• How can I use the 3CX Tunnel with a SIP hardphone?
• How do I configure my Linksys router for 3CX Phone System?
• How to use fax if using multiple network interfaces
• How can I localize 3CX Phone System?
• How does Phone provisioning work?
• How do I create a phone provisioning template?
• How does 3CX Phone System decide whether a call is internal or external?
• What is the firewall checker and why do i need it?
• What is the cause of Installer error 2738, when installing 3CX?
• Configuring the Patton gateway to receive Fax calls
• What’s new in 3CX Phone System V5?
• Can I still download V3?
• How to solve Source identification errors
• What is a SIP domain and how do I configure it correctly?
• How can I launch a call from a web based CRM package?
• How does 3CX know its an external extension?
• Does 3CX Support SIP trunking/ SIP trunks?
• 3CX Phone System Commercial & Free editions support page
• How do I configure Patton ISDN VOIP Gateways for a Point-to-Point Connection?
• How can I adjust the configuration for unsupported VOIP providers or gateways?
• Is the Linksys SPA400 Supported?
• How do I configure direct SIP Calls?
• What Call Progress Tones should I enter for my country?
• Can hotels with Micros Fidelio use 3CX Phone System?
• Configuring Exchange Server 2007 Unified messaging with 3CX Phone System
• What SIP Phones can I use with 3CX Phone System?
• What VOIP Gateways can I use with 3CX Phone System?
• Does 3CX VOIP Phone System work with Vonage?
• How to request support from 3CX
• How to convert a Cisco 7940 from SCCP to SIP
• Build History
• Does 3CX Phone System work with BroadVoice?
• What is the difference between the Free edition and the Commercial editions?
• Analyzing a SIP call
• Will a Linux version be available?