Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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Destination Port
(Listening port)
Description of destination port
IP address of
LDAP server
Determined by
destination device.
LDAP protocol port, it is used to
obtain the contact information
from LDAP server.
NTP protocol port, it is used to
synchronize time from NTP time
server.
IP address of
syslog server
Syslog protocol port, it is used
for IP phones to upload syslog
information to syslog server.
IP address of PNP
server (Default
value: 224.0.1.75)
Protocol port, it is used to obtain
the URL of updating file from
PNP server.
Determined
by the
destination
HTTP port (default value: 80)
HTTP port (default value: 443)
SIP protocol port, it is used for
signaling interaction with SIP
server.
IP phone
of voice
gateway
IP address
of IP
phone or
voice
RTP protocol port, it is used by
destination device to send or
receive audio stream.
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