Yealink T21PE2 User Manual

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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X is the account ID. For T54S/T48S/T48G/T46S/T46G/T29G, X=1-16; for T52S/T42GT42S, X=1-12; for T41P/T41S/T27G,
X=1-6; for T40P/T40G/T23P/T23G, X=1-3; for 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 IP 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. IP 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=sendonly). The other is
RFC 2543, 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 IP 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
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<MAC>.cfg
Description
It enables or disables the IP phone to use inactive outgoing hold signaling.
Note: It works only if “sip.rfc2543_hold" is set to 0 (Disabled).
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 packets
will not be sent or received.
Default 0
Parameter features.play_hold_tone.enable <y0000000000xx>.cfg
Description It enables or disables the IP phone to play the call hold tone when you place a call on hold.
Permitted
Values
0-Disabled
1-Enabled

Yealink T21PE2 Specifications

General

Brand	Yealink
Model	T21PE2
Category	IP Phone
Language	English