Yealink SIP-T48G Administrator's Manual page 568

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Phone User Interface:
None
action_url.call_terminated
Description:
Configures the action URL the IP phone sends when terminating a call.
Example:
action_url.call_terminated = http://192.168.0.20/help.xml?IP=$ip
Web User Interface:
Features->Action URL->Terminated
Phone User Interface:
None
action_url.busy_to_idle
Description:
Configures the action URL the IP phone sends when changing the state of the IP
phone from busy to idle.
Example:
action_url.busy_to_idle = http://192.168.0.20/help.xml?IP=$ip
Web User Interface:
Features->Action URL->Busy To Idle
Phone User Interface:
None
action_url.idle_to_busy
Description:
Configures the action URL the IP phone sends when changing the state of the IP
phone from idle to busy.
Example:
action_url.idle_to_busy = http://192.168.0.20/help.xml?IP=$ip
Web User Interface:
Features->Action URL->Idle To Busy
Phone User Interface:
548
Parameters Permitted Values
URL within 511 characters
URL within 511 characters
URL within 511 characters
Default
Blank
Blank
Blank