3CX PBX in the Cloud
1 year FREE - no ties!
google cloud platform
Gear up your PBX
On-premise or in the cloud - cut costs!
Take control of your PBX
Self host in cloud or Virtualize
Slash your Phone Bill
Use SIP trunks, WebRTC & Softphones
Unified Communications
Presence, Chat, Voicemail, Fax 2 Email
Office Without Limits
Make calls anywhere using Android, iPhone, Mac & Windows
Web Conferencing
Clientless via WebRTC with 3CX WebMeeting


Your SIP Server Software. Free with 3CX.
Get your free SIP Server Software available on Windows, Linux or in the cloud.

Looking to set up a complete IP PBX in minutes? Then look no further. 3CX is a SIP server that works with popular VoIP Gateways and SIP phones and allows you to do just that. You can download and install 3CX’s SIP server on Windows or Linux in a matter of minutes. And once installed the configuration can be done easily via the easy to use web interface.

Free for 16 sim calls – unlimited extensions
Free web conferencing (25 participants)
Supports SIP 2.0
Supports standard PSTN/Telephone lines via SIP Gateways and Audiocodes
Supports the use of SIP Trunks and SIP providers
Supports main codecs including G711, GSM, IspeeX and ILBLC
3CX VoIP Clients for Android and iOS
Get 3CX Free for 1 Year Today
Download On-Premise Try in the Cloud