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4600 Series IP Telephone LAN Administrator’s Guide
TCP/UDP Port Utilization
2-8
Figure 2-2. 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
Initialization and Address Resolution
DHCP Server
Port: 67
DHCP (UDP/IP)
TFTP Read Request (UDP/IP)
TFTP Data, ACKs & Errors (UDP/IP)
DNS (UDP/IP)
DNS Server
Port: 53
TFTP Server
Port: 69
Port: Operating System –
selected (a new port is
used for each file
transferred)