Call Hold; Call Hold Configuration - Yealink SIP-T3 Administrator's Manual

Administrator's Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
[1]
X is the account ID. For T57W/T54W/T48U/T48S/T48G/T46U/T46S/T46G/T29G, X=1-16; for
T53W/T53/T53C/T43U/T42U/T42G/T42S, X=1-12; for T41P/T41S/T27G, X=1-6; for T33P/T33G, X=1-4; for
T40P/T40G/T23P/T23G, X=1-3; for T31P/T31G/T31/T21(P) E2, X=1-2.

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
RFC 3264, which sets the "a" (media attribute) in the SDP to sendonly, recvonly or inactive (for example, a=se-
endonly). The other is RFC
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
Description It enables or disables the phone to use RFC 2543 (c=0.0.0.0) outgoing hold signaling.
0-Disabled, SDP media direction attributes (such as a=sendonly) per RFC 3264 is used when placing
a call on hold.
Permitted
Values
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
It enables or disables the phone to use inactive outgoing hold signaling.
Description
Note: It works only if "sip.rfc2543_hold" is set to 0 (Disabled).
0-Disabled, SDP media direction attribute "a=sendonly" is used when placing a call on hold.
Permitted
1-Enabled, SDP media direction attribute "a=inactive" is used when placing a call on hold. RTP pack-
Values
ets will not be sent or received.
Default
0
Parameter features.play_hold_tone.enable
Description It enables or disables the phone to play the call hold tone when you place a call on hold.
Permitted
0-Disabled
Values 1-Enabled
Default 1
438
2543, which sets the "c" (connection addresses for the media streams) in the SDP to
[1]
<y0000000000xx>.cfg
<MAC>.cfg
<y0000000000xx>.cfg