Yealink SIP-T4X, Administrator'S Manual

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Configuring Basic Features
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3. Click Confirm to accept the change.
To configure call hold tone and call hold tone delay via web user interface:
1. Click on Features->General Information.
2. Select the desired value from the pull-down list of Play Hold Tone.
3. Enter the desired time in the Play Hold Tone Delay field.
4. Click Confirm to accept the change.
Call forward allows users to redirect an incoming call to a third party. IP phones redirect
an incoming INVITE message by responding with a 302 Moved Temporarily message,
which contains a Contact header with a new URI that should be tried. Three types of call
forward:

Always Forward -- Forward the incoming calls immediately.

Busy Forward -- Forward the incoming call when the callee is busy.

No Answer Forward -- Forward the incoming call after a period of ring time.
Call forward can be configured on a phone or per-line depending on the call forward
mode. The following describes the call forward modes:

Phone (default): Call forward feature is effective for all accounts on the IP phone.

Custom: Call forward feature can be configured for each or all accounts.