Yealink SIP-T2XP, Provisioning Manual

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Appendix
75
If you want to reset the configuration of a parameter, set the value of the parameter to !NULL! or %NULL%. For example, local_time.ntp_server1 = %NULL%.
After the auto provisioning process is completed, the NTP server 1 will be reset to “cn.pool.ntp.org”.
Parameter Permitted Values Descriptions Web Setting Path
network.ip_address_mode = 0, 1 or 2
It configures the IP address mode.
0-IPv4
1-IPv6
2-IPv4&IPv6
The default value is 0.
It takes effect after a reboot.
Network->Basic-> Internet Port->
Mode (IPv4/IPv6)
network.internet_port.type = 0, 1 or 2
It configures the Internet (WAN) port type for
IPv4 when the IP address mode is
configured as IPv4 or IPv4&IPv6.
0-DHCP
1-PPPoE (not applicable to
SIP-T42G/T41P/CP860 IP phones)
2-Static IP Address
The default value is 0.
It takes effect after a reboot.
Network->Basic-> IPv4 Config