Accessing your 3CX phone server from outside your network although rewarding and very achievable, can be fraught with concerns and should only be attempted by a qualified person. The details listed below are for information only and in no way accept any liability however caused when used.
Ports used by 3CX Phone System
The following is a complete list of ports that 3CX PhoneSystem uses in a default installation scenario:
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TCP:80
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…
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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)
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TCP:5000
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If 3CX is installed for Cassini, this is the default port number to reach the 3CX MyPhone Interface (http://:5000)
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UDP:5060
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3CX Phonesystem (SIP)
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UDP&TCP:5080
UDP&TCP:5081
etc
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Listener for the 3CX Tunnel Protocol for bridge connections. Each tunneled bridge connection binds to a port number incrementally.
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UDP&TCP:5090
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3CX Tunnel Tunnel
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UDP:5100
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3CX Fax Receiving Service (SIP)
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TCP:5480
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3CX PhoneSystem Database Server (PostgreSQL)
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TCP:5481
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If 3CX is installed for Cassini, this is the default port number to reach the 3CX Management Console (http://:5481)
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TCP:5482
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3CX PhoneSystem for inter-process communications
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TCP:5484
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3CX IVR vXML Server (both IIS and Cassini install scenarios)
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TCP:5485
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3CX Configuration Server
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UDP:5486
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3CX Assistant Server
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UDP:7000-7499
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Default Range of ports for RTP Media Exchange with devices on the LAN (typically internal extensions, gateways, tunneled connections)
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UDP:9000-9049
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Default Range of ports for RTP Media Exchange with devices on the WAN (typically voip providers, external extensions)
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UDP:10000
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3CX FAX Receiving Service for T.38 UDPTL traffic
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UDP:40000
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3CX Parking Orbit Service (SIP)
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UDP:40010-40138
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3CX Parking Orbit Service (RTP)
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UDP:40300
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3CX Conference place Service (SIP)
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UDP:40310-40438
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Conference place Service (RTP)
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UDP:40600
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3CX IVR Service (SIP)
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UDP:40610-40866
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3CX IVR Service (RTP)
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