The following is a complete list of ports that 3CX PhoneSystem uses in a default installation scenario: TCP:80 … If 3CX is installed for IIS, this is the default port number to reach the 3CX Management Console (http:// /management) and the 3CX MyPhone Interface (http:// /myphone) TCP:5000 If 3CX is installed for Cassini, this is the default port number to reach the 3CX MyPhone Interface (http:// :5000) UDP:5060 3CX Phonesystem (SIP) UDP&TCP:5080 UDP&TCP:5081 etc Listener for the 3CX Tunnel Protocol for bridge connections. Each tunneled bridge connection binds to a port number incrementally. UDP&TCP:5090 3CX Tunnel Tunnel UDP:5100 3CX Fax Receiving Service (SIP) TCP:5480 3CX PhoneSystem Database Server (PostgreSQL) TCP:5481 If 3CX is installed for Cassini, this is the default port number to reach the 3CX Management Console (http:// :5481) TCP:5482 3CX PhoneSystem for inter-process communications TCP:5484 3CX IVR vXML Server (both IIS and Cassini install scenarios) TCP:5485 3CX Configuration Server UDP:5486 3CX Assistant Server UDP:7000-7499 Default Range of ports for RTP Media Exchange with devices on the LAN (typically internal extensions, gateways, tunneled connections) UDP:9000-9049 Default Range of ports for RTP Media Exchange with devices on the WAN (typically voip providers, external extensions) UDP:10000 3CX FAX Receiving Service for T.38 UDPTL traffic UDP:40000 3CX Parking Orbit Service (SIP) UDP:40010-40138 3CX Parking Orbit Service (RTP) UDP:40300 3CX Conference place Service (SIP) UDP:40310-40438 Conference place Service (RTP) UDP:40600 3CX IVR Service (SIP) UDP:40610-40866 3CX IVR Service (RTP) Continue reading → … [+]