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Destination port
Source port
Use
Protocol
UDP or TCP
68
Any
Received DHCP
messages
UDP
SIP messages initiated
by the call server should
be sent to the port
number specified by the
value of SIPPORT
(TCP). Responses to
SIP messages initiated
by the phone should be
sent to the number used
in the Source Port field
of the message from the
phone.
Any
Received signaling
protocol
TCP
The number used in the
Source Port field of the
DNS query that the
phone sends
Any
Received DNS
messages
UDP
The number used in the
Source Port field of the
SNTP query that the
phone sends
Any
Received SNTP
messages
UDP
161
Any
Received SNMP
messages
UDP
Related links
on page 72
Transmitted packets (source = SIP phone)
Destination port
Source port
Use
Protocol
UDP or TCP
53
Any unused port number Transmitted DNS
messages
UDP
67
68
Transmitted DHCP
messages
UDP
80, unless explicitly
specified otherwise
Any unused port number Packets transmitted by
the HTTP client of the
phone
TCP
123
Any unused port number Transmitted SNTP
messages
UDP
Table continues…
TCP and UDP ports
April 2020
Installing and Administering Avaya J100 series IP Phones in an Open SIP
environment
73