Other network considerations
Issue 3 January 2014 31
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 that the deskphone
sends
Any Received DNS messages UDP
The number used in the
Source Port field of the
packets that the HTTP client
of the deskphone sends
Any Packets that the HTTP
client of the deskphone
receives
TCP
The number used in the
Source Port field of the TLS/
SSL packets that the HTTP
client of the deskphone sends
Any TLS/SSL packets that the
HTTP client of the
deskphone receives
TCP
68 Any Received DHCP messages UDP
The number used in the
Source Port field of the SNTP
query that the deskphone
sends
Any Received SNTP messages UDP
161 Any Received SNMP messages UDP
SIP messages initiated by the
call server should be sent to
the port number specified by
the value of SIPPORT (UDP
and TCP) or to the port
number specified by the value
of SIP_PORT_SECURE (TLS
over TCP). Responses to SIP
messages initiated by the
deskphone should be sent to
the number used in the
Source Port field of the
message from the deskphone.
Any Received signaling protocol
packets
UDP/TCP
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