Yealink SIP-T48G Administrator's Guide

Configuring Basic Features
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4. Click Confirm to accept the change.
The IP phone can send the line number in the REGISTER message. SIP send line allow
adding “Line:<linenumber>”(e.g., Line: 1) to the SIP header of the REGISTER message.
The line number is a number between 0 and 15.
The following table lists line number values for each phone model.
Phone Model
Line Number
Description
SIP-T48G/T46G/T29G
0~15
0~15 stand for line1~line16
SIP-T42G
0~11
0~11 stand for line1~line12
SIP-T41P/T27P
0~5
0~5 stand for line1~line6
SIP-T40P/T23P/T23G
0~2
0~2 stand for line1~line3
SIP-T21(P) E2
0~1
0~1 stand for line1~line2
SIP-T19(P) E2/CP860
0
0 stand for line1
Example of a SIP REGISTER message:
REGISTER sip:10.2.1.48:5060 SIP/2.0
Via: SIP/2.0/UDP 10.3.20.14:5060;branch=z9hG4bK3990593443
From: "11" <sip:11@10.2.1.48:5060>;tag=255071842
To: "11" <sip:11@10.2.1.48:5060>
Call-ID: 1_2369214377@10.3.20.14
CSeq: 2 REGISTER
Contact: <sip:11@10.3.20.14:5060;line=1da6aa8d7254654>
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER,
PUBLISH, UPDATE, MESSAGE
Max-Forwards: 70
User-Agent: Yealink SIP-T23G 44.80.0.60
Expires: 0
Allow-Events: talk,hold,conference,refer,check-sync
Line: 1
Content-Length: 0
Procedure
SIP send line can be configured using the configuration files or locally.
Configuration File
<MAC>.cfg
Configure SIP send line on a
per-line basis.
Parameters:
account.X.register_line

Yealink SIP-T48G Specifications

General

Expansion module support	Yes
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Volume control	-
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
AC adapter input voltage	100 - 240 V
Number of handles included	1 pc(s)

Weight and Dimensions

Width	266 mm
Height	185 mm