Port Forwarding

During the setup of a phone system connected to the internet via SIP trunks, you will be required to forward ports. This is to enable the SIP trunk to register to the carrier, and be able to send SIP traffic back and forth.

Depending on what environment your 3CX server is sitting behind, there will be different levels of difficulty to forward the ports. Using one of the 3CX supported public cloud providers (Google, OVH, Amazon Web Serices, 1&1, Microsoft Azure) ensures that port forwarding will be an easy process.

For more information about forwarding please get in touch with your 3CX partner.

3CX ports used during a default installation

ProtocolPort (Default)DescriptionPort Forwarding
TCP5001 or 443HTTPS port of the web server. This port can be configured. Note: Only v15 is supported.Required if:

  • using a 3CX client
  • Remote IP Phones from outside your LAN and 3CX WebMeeting functionality
  • Bridge Presence
TCP5015This port is used during the installation process with the online web-based installer wizard only. Not used in the 3CX config command line tool.Optional:

  • If the web-based installer is from an external source
UDP & TCP50603CX Phone System (SIP)Required if:

  • using VoIP Providers, WebRTC and Remote Extensions that are not using the 3CX Tunnel Protocol
TCP50613CX Phone System (SecureSIP) TLSRequired if:

  •  Using Secure SIP remote extensions
UDP & TCP50903CX Tunnel Protocol Service ListenerRequired if: 

  • Using remote extensions using the 3CX Tunnel Protocol (within 3CX Client)
  • Using the 3CX Session Border Controller
SIP Port UDP5091Required if: 

UDP9000 – 10999 (default)3CX Media Server (RTP)Required if:

  • Using remote extensions or a VoIP Provider
RTP Ports UDP11000 – 11015Required if:

  • Port must be open when running the 3CX Firewall Checker
TCP & UDPTCP – 443, 4443 UDP – 48000 – 655353CX WebMeeting audio & video. Must be opened on the same network on which the WebMeetings will take place. Not to be opened on the PBX.Required if:

  • Using 3CX WebMeeting
TCP
Port: 5001 or 443

Description: HTTPS port of the web server. This port can be configured. Note: Only v15 is supported.

Port Forwarding Required if:

  • using a 3CX client
  • Remote IP Phones from outside your LAN and 3CX WebMeeting functionality
  • Bridge Presence
TCP
Port: 5015

Description: This port is used during the installation process with the online web-based installer wizard only. Not used in the 3CX config command line tool.

Port Forwarding > Optional:

  • If the web-based installer is from an external source
UDP & TCP
Port: 5060

Description: 3CX Phone System (SIP)

Port Forwarding > Required if:

  • using VoIP Providers, WebRTC and Remote Extensions that are not using the 3CX Tunnel Protocol
TCP
Port: 5061

Description: 3CX Phone System (SecureSIP) TLS

Port Forwarding > Required if:

  • Using Secure SIP remote extensions
UDP & TCP
Port: 5090

Description: 3CX Tunnel Protocol Service Listener

Port Forwarding > Required if:

  • Using remote extensions using the 3CX Tunnel Protocol (within 3CX Client)
  • Using the 3CX Session Border Controller
SIP Port UDP

Port: 5091

Description:

Required: Port must be open when running the 3CX Firewall Checker

UDP
Port: 9000 – 10999

Description: 3CX Media Server (RTP)

Port Forwarding > Required if:

  • Using remote extensions or a VoIP Provider
RTP Ports UDP

Port: 11000 – 11015

Description:

Required: Port must be open when running the 3CX Firewall Checker

TCP & UDP
Port: TCP – 443, 4443 UDP – 48000 – 65535

Description: 3CX WebMeeting audio & video. Must be opened on the same network on which the WebMeetings will take place. Not to be opened on the PBX.

Port Forwarding > Required if:

  • Using 3CX WebMeeting