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Network Requirements
32 9600 Series SIP IP Telephones Administrator Guide SIP Release 2.0
The number used in the
Source Port field of
registration messages sent by
the telephone’s CNA Agent
Any Received CNA registration
messages
TCP
PORTAUD or the port number
reserved for CNA RTP tests
Any Received RTP and SRTP
packets
UDP
PORTAUD + 1 (if PORTAUD
is even) or PORTAUD – 1 (if
PORTAUD is odd) or the port
number reserved for CNA
RTP tests plus or minus one,
as for PORTAUD, above
Any Received RTCP and
SRTCP packets
UDP
If signaling is initiated by the
telephone = the number used
in the Source Port field of the
signaling packets sent by the
telephone
If signaling is initiated by the
server = System-Specific
Any Received signaling protocol
packets
UDP/TCP
Table 6: Transmitted Packets (Source = SIP IP Telephone)
Destination Port Source Port Use UDP or TCP?
53 Any unused
port number
Transmitted DNS messages UDP
67 68 Transmitted DHCP
messages
UDP
80 unless explicitly specified
otherwise (i.e. in a URL)
Any unused
port number
Packets transmitted by the
telephone’s HTTP client
TCP
123 Any unused
port number
Transmitted SNTP
messages
UDP
The number used in the
Source Port field of the SNMP
query packet received by the
telephone
161 Transmitted SNMP
messages
UDP
443 unless explicitly specified
otherwise (i.e. in a URL)
Any unused
port number
TLS/SSL packets
transmitted by the
telephone’s HTTP client
TCP
1 of 3
Table 5: Received Packets (Destination = SIP IP Telephone) (continued)
Destination Port Source Port Use UDP or TCP?
2 of 2