Yealink T54S

General Features
513
General Features
This section shows you how to configure general features on Yealink IP phones.
Topics
Line Identification Presentation
Return Code for Refused Call
Hide Feature Access Codes
Accept SIP Trust Server Only
100 Reliable Retransmission
SIP Session Timer
Session Timer
Reboot in Talking
Reserve # in User Name
Busy Tone Delay
CFG File Version Information
Media Loopback
Line Identification Presentation
Yealink IP phones can derive calling and connected line identification from SIP headers
and display the name associated with the telephone number on the LCD screen.
Calling Line Identification Presentation (CLIP): It allows IP phones to display the caller identity, derived
from a SIP header contained in the INVITE message when receiving an incoming call. Yealink IP phones
can derive caller identity from three types of SIP header: From, P-Asserted-Identity (PAI) and
Remote-Party-ID (RPID). Identity presentation is based on the identity in the relevant SIP header.
Connected Line Identification Presentation (COLP): It allows IP phones to display the identity of the
connected party specified for outgoing calls. The IP phones can display the Dialed Digits, or the identity
in a SIP header (Remote-Party-ID, P-Asserted-Identity or contact) received, or the identity in the From
header carried in the UPDATE message sent by the callee as described in RFC 4916. Connected line
identification presentation is also known as Called line identification presentation. In some cases, the
remote party will be different from the called line identification presentation due to call diversion.
Note
If the caller/callee already exists in the local directory, the local contact name assigned to the caller will be
preferentially displayed and stored in the call log.
For more information on calling line identification presentation, refer to Calling and Connected Line