Yealink SIP-T2 Series Administrator's Manual page 415

Procedure
Call hold can be configured using the following methods.
Central Provisioning
(Configuration Files)
Web User Interface
Details of Configuration Parameters:
Parameters
features.play_hold_tone.enable
Description:
Enables or disables the IP phone to play the call hold tone when you place a call on hold.
<y0000000000xx>.cfg
<MAC>.cfg
Configuring Basic Features
Configure the Call Hold Tone.
Parameters:
features.play_hold_tone.enable
features.play_hold_tone.delay
features.play_hold_tone.interval
Configure the Call Held Tone.
Parameters:
features.play_held_tone.enable
features.play_held_tone.delay
features.play_held_tone.interval
Specify whether RFC 2543
(c=0.0.0.0) outgoing hold signaling
is used.
Parameter:
sip.rfc2543_hold
Specify whether to use inactive hold
signaling.
Parameter:
account.X.hold_use_inactive
Configure the call hold tone and call
hold tone delay.
Specify whether RFC 2543
(c=0.0.0.0) outgoing hold signaling
is used.
Navigate to:
http://<phoneIPAddress>/servlet?p
=features-general&q=load
Permitted Values
0 or 1
Default
1
393