Destination port
Source port
Use
UDP or TCP?
The number used in the Source
Port field of RAS packets that are
sent by the phone
1719
H.323 RAS messages
UDP
The next higher port number if the
port used for RTP is even, or the
next lower port number if the port
used for RTP is odd
Any
Received RTCP and SRTCP
packets
UDP
The number used in the Source
Port field of registration messages
that are sent by the SLA agent on
the phone
Any
Received SLA registration
messages
TCP
Any
1300
H.323 signaling messages in
TLS_TTS mode re-registration.
Port 1300 is closed when using
non TTS method to connect to
the gatekeeper or when H.323
signaling is not over TLS. When
the port is open, the phone does
not respond to incoming
packets to this port from IP
addresses that are not in the
gatekeeper list.
TCP
Note:
CNA is not supported in Release 6.2 and later. SLA is supported in Release 6.4 and later.
Table 4: Transmitted packets (Source = IP phones)
Destination Port
Source Port
Use
UDP or TCP?
7
Any unused port
number
Transmitted Qtest messages
UDP
The number used in the Source
Port field of packets that are
received by the SSH server of the
phone.
22
Packets that are transmitted by
the SSH server of the phone
TCP
53
Any unused port
number
Transmitted DNS messages
UDP
67
68
Transmitted DHCP messages
UDP
HTTPPORT
Any unused port
number
Packets that the HTTP client
transmits on the phone during
startup
TCP
80 unless explicitly specified
otherwise, for example, in a URL
or because of use of WMLPORT
Any unused port
number
Packets that the HTTP client of
the phone transmits after
TCP
Table continues…
Administering your phone
May 2018
Installing and Administering Avaya J169/J179 IP Phone H.323
66