Ports Used by 3CX Phone System v15
The following is a complete list of ports that 3CX Phone System uses in a default installation scenario:
Port Forwarding Required
5001 or 443
v15: HTTPs port of Web Server. This port can be configured.
Yes – if you intend on using a 3CX client, Bridge Presence, Remote IP Phones from outside your LAN and 3CX WebMeeting functionality.
V15: This port is used for the online Web-Based installer wizard (NOT 3CX config command line tool) only during the installation process.
Optional - During the installation process when the Web-Based installer is used from external source
UDP & TCP
3CX Phone System (SIP)
Yes – if you intend on using VoIP Providers, WebRTC and Remote Extensions that are NOT using the 3CX Tunnel Protocol
3CX Phone System (SecureSIP) TLS
Yes – if you intend on using Secure SIP remote extensions
UDP & TCP
3CX Tunnel Protocol Service Listener
Yes -if you intend on using remote extensions using the 3CX Tunnel Protocol (within the 3CX clients for Windows / Android / iOS) or when using the 3CX Session Border Controller
3CX Media Server (RTP) – WAN audio/video/t38 streams
Yes – if you intend on using remote extensions or a VoIP Provider