Yealink SIP-T2 SERIES Administrator's Manual page 382

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
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 (e.g., a=sendonly). The other is RFC 2543, which sets the
―c‖ (connection addresses for the media streams) in the SDP to zero (e.g., c=0.0.0.0).
Call hold tone allows IP phones to play a warning tone at regular intervals when there is
a call on hold. The warning tone is played through the speakerphone.
Procedure
Call hold can be configured using the configuration files or locally.
Configuration File
Local
360
<y0000000000xx>.cfg
Web User Interface
Configure the call hold tone and
call hold tone delay.
Parameters:
features.play_hold_tone.enable
features.play_hold_tone.delay
Specify whether RFC 2543
(c=0.0.0.0) outgoing hold
signaling is used.
Parameter:
sip.rfc2543_hold
Configure the call hold tone and
call hold tone delay.
Specify whether RFC 2543
(c=0.0.0.0) outgoing hold
signaling is used.
Navigate to:
For
SIP-T48G/T46G/T42G/T41P/T40P/T2
9G/T27P/T23P/T23G/T21(P)
E2/T19(P) E2/CP860:
http://<phoneIPAddress>/servlet
?p=features-general&q=load
For SIP VP-T49G:
http://<phoneIPAddress>/servlet
?m=mod_data&p=features-gen
eral&q=load