Yealink SIP-T4X, Administration Manual

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Administrator’s Guide for SIP-T4X IP Phones
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the IP phone plays a hold tone.
If it is set to 30, the IP phone will play a hold
tone every 30 seconds when there is a hold
call on the IP phone.
Note: It works only if the parameter
“features.play_hold_tone.enable” is set to 1
(Enabled).
Format Integer
Default Value 30
Range 3 to 3600
Example features.play_hold_tone.delay = 30
Parameter-
sip.rfc2543_hold
Configuration File
<y0000000000xx>.cfg
Description
Configures whether RFC 2543 (c=0.0.0.0)
outgoing hold signaling is used.
If it is set to 0 (Disabled), the phone will use
SDP media direction attributes (such as
a=sendonly) per RFC 3264 when putting a
call on hold.
If it is set to 0 (Enabled), the phone will use
SDP media connection address c=0.0.0.0 per
RFC 2543 when putting a call on hold.
Format Boolean
Default Value 0
Range
Valid values are:
0-Disabled
1-Enabled
Example sip.rfc2543_hold = 1
Call Forward Mode
Parameter-
features.fwd_mode
Configuration File
<y0000000000xx>.cfg
Description Configures the call forward mode for the IP