Dhcp Option 120; Dhcp Option 120 Configuration - Yealink SIP-T2 Series Administrator's Manual

For T48S IP phones: SIP-T48S.
For T46G IP phones: SIP-T46G.
For T46S IP phones: SIP-T46S.
For T42G IP phones: SIP-T42G.
For T42S IP phones: SIP-T42S.
For T41P IP phones: SIP-T41P.
For T41S IP phones: SIP-T41S.
For T40P IP phones: SIP-T40P.
For T40G IP phones: SIP-T40G.
For T29G IP phones: SIP-T29G.
For T27G IP phones: SIP-T27G.
For T23P IP phones: SIP-T23P.
For T23G IP phones: SIP-T23G.
For T21(P) E2 IP phones: SIP-T21P_E2.
For T19(P) E2 IP phones: SIP-T19P_E2.
For CP920 IP phones: SIP-CP920.
Web UI Features->General Information->DHCP Hostname
[1]
If you change this parameter, the IP phone will reboot to make the change take effect.

DHCP Option 120

DHCP option 120 is used by the SIP client to locate a SIP server or outbound proxy server.
Topic

DHCP Option 120 Configuration

DHCP Option 120 Configuration
The following table lists the parameter you can use to configure DHCP option 120.
Parameter sip.dhcp.option120.mode
Description It configures whether to use DHCP option 120 for obtaining the outbound proxy server IP address.
0-Do not check with the DHCP server for the outbound proxy server IP address.
1-The value obtained from DHCP option 120 is used as outbound proxy server IP address (can resolve up
to two domain names or IPv4 addresses). If "account.X.outbound_proxy_enable = 1", and primary out-
bound proxy server is configured, the address from DHCP option 120 is used as secondary one; if the
Permitted
primary outbound proxy server is not configured, the address from DHCP option 120 is used as primary
Values
one.
2-The value obtained from DHCP option 120 is used as SIP server IP address (can resolve up to only one
IPv4 address). If primary SIP server is configured, the address from DHCP option 120 is used as secondary
one; if primary SIP server is not configured, the address from DHCP option 120 is used as primary one.
<y0000000000xx>.cfg
Phone Network
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