TCP 5090
Synopsis
- 3CX Phone System uses TCP port 5090 for its 3CX Tunnel service, which encapsulates SIP/RTP to simplify NAT/firewall traversal for remote extensions.
- The 3CX Session Border Controller (SBC) also connects to the 3CX PBX on TCP 5090 by default to proxy phones at branch sites.
- 3CX softphones and mobile apps commonly use TCP 5090 when the tunnel is enabled to reach the PBX from outside the LAN.
Observed activity
Last 30 days
Detailed chart