Yealink SIP-T54S Administrator's Manual page 763

Parameters
Example:
action_url.call_waiting_off = http://192.168.0.20/help.xml?IP=$ip
Web User Interface:
Features->Action URL->Close Call Waiting
Phone User Interface:
None
action_url.headset
Description:
Configures the action URL the IP phone sends when pressing the HEADSET key.
Example:
action_url.headset = http://192.168.0.20/help.xml?IP=$ip
Note: It is not applicable to CP860/CP920 IP phones.
Web User Interface:
Features->Action URL->Headset
Phone User Interface:
None
action_url.handfree
Description:
Configures the action URL the IP phone sends when pressing the Speakerphone key.
Example:
action_url.handfree = http://192.168.0.20/help.xml?IP=$ip
Note: It is not applicable to CP860/CP920 IP phones.
Web User Interface:
Features->Action URL->Handfree
Phone User Interface:
None
action_url.cancel_callout
Description:
Configures the action URL the IP phone sends when cancels the outgoing call in the ring-
Configuring Advanced Features
Permitted Values
URL within 511 characters
URL within 511 characters
URL within 511 characters
Default
Blank
Blank
Blank
737