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Overview of Voice over IP (VoIP) and Network Protocols
28 4600 Series IP Telephone Release 2.2 LAN Administrator Guide
Figure 1: Signaling, Audio and Management Diagram
4600 Series IP Telephone
Port: 49300
Port: [1500–6500]
randomly selected
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 + 2
(only active during a call
if RTCP monitoring
is enabled)
Port:161
Port: [33435 – 33524]
Operating System
selected
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)
RTCP (UDP/IP)
SNMP (UDP/IP)
SNMP MIB Viewer
Port depends on
MIB viewer admin
Voice Monitoring
Manager
Port depends on Voice
Monitoring Manager
admin
Media Gateway or
another IP endpoint
Port selected from the
audio port range
administered for the
network region
Port: audio port + 1
Remote Traceroute (UDP)
Far end of audio
channel
Port Determined
locally