Yealink IP Phones Configuring Guide
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Destination Port
(Listening port)
Description of destination port
IP address of
DHCP server
DHCP protocol port, it is used to
obtain IP address from DHCP
server.
IP address of
LDAP server
Determined by the
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.
HTTP port (default value: 80)
HTTP port (default value: 443)
SIP protocol port, it is used for
signaling interaction with the SIP
server.
RTP protocol port, it is used by