Yealink T21PE2 User Manual

General Features
469
General Features
This section shows you how to configure general features on Yealink IP phones.
Topics
Line Identification Presentation
Return Code for Refused Call
Return Code for Unanswered 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
Cloud
Line Identification Presentation
Yealink IP phones can derive calling and connected line identification from SIP headers and display the name asso-
ciated 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 iden-
tification 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 dis-
played and stored in the call log.
For more information on calling line identification presentation, refer to Calling and Connected Line Identification
Presentation on Yealink IP Phones.
Topic
CLIP and COLP Configuration
CLIP and COLP Configuration
The following table lists the parameters you can use to configure the CLIP and COLP.
Parameter
account.X.cid_source
[1]
<MAC>.cfg

Yealink T21PE2 Specifications

General

Brand	Yealink
Model	T21PE2
Category	IP Phone
Language	English