Call Features
361
Call Hold
Call hold provides a service of placing an active call on hold. It enables you to pause activity on an active call so
that you can use the phone for another task, for example, to place or receive another call.
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. The phones support two call hold methods, one is
, which sets the “a” (media attribute) in the SDP to sendonly, recvonly or inactive (for example, a=se-
endonly). The other is
, which sets the “c” (connection addresses for the media streams) in the SDP to
zero (for example, c=0.0.0.0).
When you place an active call on hold or the call is held by remote parry, a call hold tone or held tone alerts you
after a specific period of time that a call is still on hold or is still held by the remote party. You can configure the call
hold tone and held tone.
If supported by the server, you can also configure a music-on-hold URI.
Topics
Call Hold Configuration
Music on Hold (MoH) Configuration
Call Hold Configuration
The following table lists the parameters you can use to configure call hold.
Parameter sip.rfc2543_hold
<y0000000000xx>.cfg
Description It enables or disables the phone to use RFC 2543 (c=0.0.0.0) outgoing hold signaling.
Permitted
Values
0-Disabled, SDP media direction attributes (such as a=sendonly) per RFC 3264 is used when placing
a call on hold.
1-Enabled, SDP media connection address c=0.0.0.0 per RFC 2543 is used when placing a call on
hold.
Default
0
Web UI
Features > General Information > RFC 2543 Hold
Parameter account.X.hold_use_inactive
[1]
<MAC>.cfg
Description
It enables or disables the phone to use inactive outgoing hold signaling.
Note: It works only if “sip.rfc2543_hold" is set to 0 (Disabled). It is not applicable to CP960 phones.
Permitted
Values
0-Disabled, SDP media direction attribute “a=sendonly” is used when placing a call on hold.
1-Enabled, SDP media direction attribute “a=inactive” is used when placing a call on hold. RTP pack-
ets will not be sent or received.
Default
0
Parameter features.play_hold_tone.enable
<y0000000000xx>.cfg
Description It enables or disables the phone to play the call hold tone when you place a call on hold.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Web UI
Features > General Information > Play Hold Tone
Parameter features.play_hold_tone.delay
<y0000000000xx>.cfg
Description It configures the time (in seconds) to wait for the phone to play the initial call hold tone.
Summary of Contents for One Talk CP960
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