Administrator’s Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
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Early Media Configuration
The following table lists the parameters you can use to configure the early media.
Parameter
phone_setting.early_media.rtp_sniffer.timeout
[1]
<y0000000000xx>.cfg
Description
It configures the time to wait for the phone to play the local ringback tone when the early media cannot
be played.
Permitted
Values
-1
-Do not play the local ringback tone
0
-Play the local ringback tone immediately
1-100
-Wait for a specified time to play the local ringback tone
Default
1
Parameter
phone_setting.is_deal180
<y0000000000xx>.cfg
Description
It enables or disables the phone to deal with the 180 SIP message received after the 183 SIP mes-
sage.
Permitted
Values
0
-Disabled
1
-Enabled, the phone will resume and play the local ringback tone upon a subsequent 180 message
received.
Default
1
Web UI
Features > General Information > 180 Ring Workaround
Parameter
phone_setting.change_183_to_180
<y0000000000xx>.cfg
Description
It enables or disables the phone to handle the received second 183 message as the 180 message.
Permitted
Values
0
-Disabled
1
-Enabled, the phone will play the early media first and play the local ringback tone when receiving
the second 183 message.
Default
0
[1]
If you change this parameter, the phone will reboot to make the change take effect.
Headset Prior
Headset prior allows users to use headset preferentially if a headset is physically connected to the IP phone. This
feature is especially useful for permanent or full-time headset users.
It is not applicable to CP920 phones.
Note
: It is not applicable to the Bluetooth headset and USB headset.
Topic
Headset Prior Configuration
The following table lists the parameters you can use to configure the headset prior.
Parameter
features.headset_prior
<y0000000000xx>.cfg
Description
It enables or disables to preferentially use the headset mode for all incoming and outgoing calls.
