Dhcp Option 120 - Yealink T54S Administrator's Manual

For T52S IP phones: SIP-T52S.
For T48G IP phones: SIP-T48G.
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 T27P IP phones: SIP-T27P.
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.
Features->General Information->DHCP Hostname
Web UI
[1]
If you change this parameter, the IP phone will reboot to make the change take effect.

DHCP Option 120

The DHCP option 120 is used by the SIP client to locate a local 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.
sip.dhcp.option120.mode
Parameter
It configures whether to use DHCP option 120 for obtaining the outbound proxy
Description
server IP address.
0-Do not check with the DHCP server for the outbound proxy server IP address.
Permitted
1-The value obtained from DHCP option 120 is used as outbound proxy server IP
Values
address (can resolve up to two domain names or IPv4 addresses). If
Phone Network
<y0000000000xx>.cfg
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