Yealink SIP-T48G Administrator's Manual page 145

call hold methods, one is RFC 3264, which sets the "a" (media attribute) in the SDP to
sendonly, recvonly or inactive (e.g., a=sendonly). The other is RFC 2543, which sets the
"c" (connection addresses for the media streams) in the SDP to zero (e.g., c=0.0.0.0).
Call hold tone allows IP phones to play a warning tone at regular intervals when there is
a call on hold. The warning tone is played through the speakerphone.
Procedure
Call hold can be configured using the configuration files or locally.
Configuration File
Local
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
<y0000000000xx>.cfg
Web User Interface
Configuring Basic Features
Configure the call hold tone and
call hold tone delay.
Parameters:
features.play_hold_tone.enable
features.play_hold_tone.delay
Configure the call hold tone and
call hold tone delay.
Navigate to:
http://<phoneIPAddress>/servlet
?p=features-general&q=load
Permitted Values
0 or 1
Integer from 3 to 3600
Default
1
30
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