Yealink SIP-T4X Administrator's Manual page 93

2. Enter the desired time (in seconds) in the Auto-Answer Delay (1~4s) field.
3. Click Confirm to accept the change.
To configure auto answer via phone user interface:
1. Press Menu->Call Features->Auto Answer.
2. Select the desired line and then press the Enter soft key.
3. Press or , or the Switch soft key to select the desired value from the Auto
Answer field.
4. Press the Save soft key to accept the change.
Call completion allows users to monitor the busy party and establish a call when the
busy party becomes available to receive a call. Two factors commonly prevent a call
from connecting successfully:
Callee does not answer

Callee actively rejects the incoming call before answering

IP phones support call completion using the SUBSCRIBE/NOTIFY method, which is
specified in draft-poetzl-sipping-call-completion-00, to subscribe to the busy party and
receive notifications of their status changes.
Configuring Basic Features
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