Yealink SIP-T2 SERIES Administrator's Manual page 379

Details of Configuration Parameters:
Parameters
features.play_hold_tone.enable
Description:
Enables or disables the IP phone to play a warning tone when there is a call on hold.
0-Disabled
1-Enabled
Web User Interface:
Features->General Information->Play Hold Tone
Phone User Interface:
None
features.play_hold_tone.delay
Description:
Configures the interval (in seconds) at which the IP phone play a warning tone when there is
a call on hold.
If it is set to 30 (30s), the IP phone will play a warning tone every 30 seconds when there is a
call on hold.
Note: It works only if the value of the parameter "features.play_hold_tone.enable" is set to 1
(Enabled).
Web User Interface:
Features->General Information->Play Hold Tone Delay
Phone User Interface:
None
sip.rfc2543_hold
Description:
Enables or disables the IP phone to use RFC 2543 (c=0.0.0.0) outgoing hold signaling.
0-Disabled
1-Enabled
If it is set to 0 (Disabled), SDP media direction attributes (such as a=sendonly) per RFC 3264
is used when placing a call on hold.
If it is set to 1 (Enabled), SDP media connection address c=0.0.0.0 per RFC 2543 is used when
placing a call on hold.
Web User Interface:
Configuring Basic Features
Permitted Values
0 or 1
Integer from 3 to 3600
0 or 1
Default
1
30
0
355