Yealink SIP-T3 Administrator's Manual page 529

Administrator's Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
Example:
action_url.forward_incoming_call = http://192.168.0.20/help.xml?IP=$ip
Permitted
URL within 511 characters
Values
Default Blank
Web UI Features > Action URL > Forward Incoming Call
Parameter action_url.transfer_finished
It configures the action URL the phone sends when completing a call transfer.
Description Example:
action_url.transfer_finished = http://192.168.0.20/help.xml?IP=$ip
Permitted
URL within 511 characters
Values
Default Blank
Web UI Features > Action URL > Transfer Finished
Parameter action_url.transfer_failed
It configures the action URL the phone sends when failing to transfer a call.
Description Example:
action_url.transfer_failed = http://192.168.0.20/help.xml?IP=$ip
Permitted
URL within 511 characters
Values
Default Blank
Web UI
Features > Action URL > Transfer Failed
Parameter action_url.setup_autop_finish
It configures the action URL the phone sends when completing auto provisioning via power on.
Description Example:
action_url.setup_autop_finish = http://192.168.0.20/help.xml?IP=$ip
Permitted
URL within 511 characters
Values
Default
Blank
Web UI Features > Action URL > Autop Finish
Parameter action_url.call_waiting_on
It configures the action URL the phone sends when the call waiting feature is enabled.
Description Example:
action_url.call_waiting_on = http://192.168.0.20/help.xml?IP=$ip
Permitted
URL within 511 characters
Values
Default Blank
Web UI Features > Action URL > Call Waiting On
523
<y0000000000xx>.cfg
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<y0000000000xx>.cfg