SIP Phone Configuration Guide
call_settings.hotline_enable
Enables or disables the hotline (Emergency Dialing) feature.
0 (disabled), 1 (enabled)
call_settings.hotline_number
Sets the number dialed by the hotline (Emergency Dialing) feature.
number or alpha-numeric ID,
with or without the host part
of the SIP URI are accepted;
IP entry has to be supported
if IP dialing is supported
call_settings.hotline_delay
Sets the delay (in seconds) between the phone going off hook and the hotline
(emergency) number being dialed.
call_settings.account.1.cfna_enable
Enables call forward when no answer
0 (disabled), 1 (enabled)
call_settings.account.1.cfna_target
Call forward when no answer target number
call_settings.account.1.cfna_delay
Set when no answer delay before call forward (number of rings)