Yealink SIP-T27P [294/841] Procedure

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series IP Phones

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5. Select the desired refresher from the pull-down list of Session Refresher.

6. Click Confirm to accept the change.

Call hold provides a service of placing an active call on hold. 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 (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

<y0000000000xx>.cfg

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: