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Overview of Voice over IP (VoIP)
TCP/UDP Port Utilization
2-9
Figure 2-3. Applications Diagram
4600 Series IP Telephone
Port: [1024 – 5000]
Operating System –
selected (only active if
DIRSRVR is non-null)
Port: [1024 – 5000]
Operating System –
selected (only active if
WEBHOME (4630),
VMLHOME (4630) or
WMLHOME (4620) is
non-null
Port: 21
(only active if user enters
FTP server IP address)
Port: 20
(only active during
a backup or restore)
Port: [49714 - 49721]
49721 unless changed
via CTIUDPPORT
(only active if
phone is registered)
Port: 49722
(only active if CTI
discovery is successful)
Applications
Directory Server
Port: 389, or as set by
DIRLDAPPORT
LDAP (TCP/IP)
HTTP (TCP/IP)
HTTP over SSL (TCP/IP)
FTP control (TCP/IP)
CTI Discovery (UDP/IP))
IP Softphone
Port: [50000 – 51000]
OS-selected
Port: [1024 – 5000]
randomly selected
FTP Server
Port:21
Port: 20
Web or Proxy Server
Port: Usually 80 for web
servers and 8000 for proxy
servers, but URLs may
specify other ports as well
Port: 443
(4630 only)
(4610SW, 4620, and 4630 only)
(4630 only)
(4610SW, 4620, and 4630 only)
(CTI is not supported by the 4602)
CTI Data (TCP/IP)
(CTI is not supported by the 4602)
FTP data (TCP/IP)
(4610SW, 4620, and 4630 only)