Yealink SIP-T2 SERIES Administrator's Manual page 654

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
action_url.unregistered = http://192.168.0.20/help.xml?IP=$ip
Web User Interface:
Features->Action URL->Unregistered
Phone User Interface:
None
action_url.register_failed
Description:
Configures the action URL the IP phone sends after a register failed.
Example:
action_url.register_failed = http://192.168.0.20/help.xml?IP=$ip
Web User Interface:
Features->Action URL->Register Failed
Phone User Interface:
None
action_url.off_hook
Description:
Configures the action URL the IP phone sends when off hook.
Example:
action_url.off_hook = http://192.168.0.20/help.xml?IP=$ip
Web User Interface:
Features->Action URL->Off Hook
Phone User Interface:
None
action_url.on_hook
Description:
Configures the action URL the IP phone sends when on hook.
Example:
action_url.on_hook = http://192.168.0.20/help.xml?IP=$ip
Web User Interface:
632
Parameters Permitted Values
URL within 511 characters
URL within 511 characters
URL within 511 characters
Default
Blank
Blank
Blank