
Supplemental Guide – DOC. 8412A
UC-P100-S/UC-P110-S Phones for Skype for Business
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When a call is placed on hold, the phones send an INVITE request with HOLD SDP to
request remote parties to stop sending media and to inform them that they are being
held. Skype for Business phones support two 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 phones to play a warning tone at regular intervals when there is a
call on hold. The warning tone is played through the speakerphone.
Call hold can be configured using the configuration files or locally.
Configuration Methods
Central Provisioning
(Configuration File)
<y0000000000xx>.cfg
Configure the call hold tone and
call hold tone delay.
Parameters:
features.play_hold_tone.enable
features.play_hold_tone.delay
Local
Web User Interface
Configure the call hold tone and call hold
tone delay.
Navigate to:
http://<phoneIPAddress>/servlet?
p=features-general&q=load
Details of the Configuration Parameters
Parameter
Permitted Values
Default
features.play_hold_tone.enable
0 or 1
1
Description:
Enables or disables the 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