Other network considerations
Issue 1 May 2011 39
Administering TCP/UDP port selection
The 9600 Series SIP IP Telephones use a variety of protocols, particularly TCP (Transmission
Control Protocol), TLS (Transport Layer Security), and UDP (User Datagram Protocol) to
communicate with other equipment in the network. Part of this communication identifies which
TCP or UDP ports each piece of equipment uses to support each protocol and each task within
the protocol. Depending on your network, you might need to know what ports or ranges are
used in the operation of 9600 Series IP Telephones. Knowing these ports or ranges helps you
administer your networking infrastructure.
Note:
Note:
In many cases, the ports used are the ones called for by IETF or other standards
bodies.
Some of the explanations in Received packets (destination = SIP deskphone)
and Transmitted packets (source = SIP Deskphone)
refer to configuration
parameters or options settings. For more information about parameters and
settings, see Administering options for the
9608, 9611G, 9621G, and 9641G SIP
Deskphones.
Received packets (destination = SIP deskphone)
Destination Port Source Port Use UDP or TCP?
The number used in the
Source Port field of the DNS
query sent by the deskphone
Any Received DNS messages UDP
The number used in the
Source Port field of the
packets sent by the
deskphone’s HTTP client
Any Packets received by the
deskphone’s HTTP client
TCP
The number used in the
Source Port field of the TLS/
SSL packets sent by the
deskphone’s HTTP client
Any TLS/SSL packets received
by the deskphone’s HTTP
client
TCP
68 Any Received DHCP messages UDP
The number used in the
Source Port field of the SNTP
query sent by the deskphone
Any Received SNTP messages UDP
161 Any Received SNMP messages UDP
50000 Any Received CNA test request
messages
UDP
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