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TCP/UDP Port Utilization
Issue 4 August 2006 39
Figure 1: Signaling, Audio and Management Diagram
4600 Series IP Telephone
Port: 49300
Port: [1500–6500]
randomly selected
Port: 5060
Port: [2048–3028]
randomly selected;
range may be changed via
Gatekeeper administration;
always an even number
Port: audio port + 1
(only active during a call
if RTCP is enabled)
Port: audio port +1 (only
active during a call if RTCP
is enabled)
Port: audio port + 2
(only active during a call
if RTCP monitoring
is enabled)
Port:161
Note: SNMP is disabled by
default.
Signaling, Audio and Management
H.323 Gatekeeper
Port: 1719
Port: 1720
H.323 RAS (UDP/IP)
H.323 Signaling (TCP/IP)
RTP Audio (UDP/IP)
RTCP (UDP/IP)
SNMP (UDP/IP)
SNMP MIB Viewer
Port depends on
MIB viewer admin
Voice Monitoring
Manager
Port depends on Voice
Monitoring Manager
administration
Media Gateway or
another IP endpoint
Port selected from the
audio port range
administered for the
network region
Port: audio port + 1
SIP Registrar/Proxy
Port: 5060
SIP (UDP/IP)
RTCP (UDP/IP)
RTCP Monitor
Port: as specified by
Communication
Manager
RTCP