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TCP/UDP Port Utilization
Issue 2.2 April 2005 29
Figure 2: Initialization and Address Resolution Diagram
4600 Series IP Telephone
Port: 68
Port: [1024 - 5000]
Operating System –
selected (a new port
is used for each file
requested)
Port: [1024 - 5000]
Operating System
–selected
Port: [1024-5000]
Operating System-
selected
Port: Operating
System-selected
Initialization and Address Resolution
DHCP Server
Port: 67
DHCP (UDP/IP)
TFTP Read Request (UDP/IP)
TFTP Data, ACKs & Errors
DNS (UDP/IP)
DNS Server
Port: 53
TFTP Server
Port: 69
Port: Operating System
– selected (a new port is
used for each file
transferred)
CNA Server
Port: As administered
in CNAPORT
HTTP Server
Port: 80
CNA (TCP)
HTTP (TCP)