Yealink SIP-T41S Administrator's Guide

Audio Features
180
1209 Hz 1336 Hz 1477 Hz 1633 Hz
697 Hz 1 2 3 A
770 Hz 4 5 6 B
852 Hz 7 8 9 C
941 Hz * 0 # D
Note: The phones will not send the DTMF sequence when the call is placed on hold or is held.
Transmitting DTMF Digit
Three methods of transmitting DTMF digits on SIP calls:
l
RFC 2833 -- DTMF digits are transmitted by RTP Events compliant with RFC 2833. You can configure the pay-
load type and sending times of the end RTP Event packet. The RTP Event packet contains 4 bytes. The 4 bytes
are distributed over several fields denoted as Event, End bit, R-bit, Volume, and Duration. If the End bit is set to
1, the packet contains the end of the DTMF event. You can configure the sending times of the end RTP Event
packet.
l
INBAND -- DTMF digits are transmitted in the voice band. It uses the same codec as your voice and is audible to
conversation partners.
l
SIP INFO -- DTMF digits are transmitted by SIP INFO messages. DTMF digits are transmitted by the SIP INFO
messages when the voice stream is established after a successful SIP 200 OK-ACK message sequence. The
SIP INFO message can transmit DTMF digits in three ways: DTMF, DTMF-Relay, and Telephone-Event.
Topic
Transmitting DTMF Digit Configuration
Transmitting DTMF Digit Configuration
The following table lists the parameters you can use to configure the transmitting DTMF digit.
Parameter
account.X.dtmf.type
[1]
<MAC>.cfg
Description
It configures the DTMF type.
Permitted
Values
0-INBAND, DTMF digits are transmitted in the voice band.
1-RFC2833, DTMF digits are transmitted by RTP Events compliant to RFC 2833.
2-SIP INFO, DTMF digits are transmitted by the SIP INFO messages.
3-RFC2833 + SIP INFO, DTMF digits are transmitted by RTP Events compliant to RFC 2833 and the
SIP INFO messages.
Default
1
Web UI
Account > Advanced > DTMF Type
Parameter
account.X.dtmf.dtmf_payload
[1]
<MAC>.cfg
Description
It configures the value of DTMF payload.
Note: It works only if “account.X.dtmf.type” is set to 1 (RFC2833) or 3 (RFC2833 + SIP INFO).
Permitted
Values
Integer from 96 to 127
Default
101

Yealink SIP-T41S Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Keypad illumination	Yes
Wi-Fi	No
Networking standards	IEEE 802.3af
Ethernet LAN data rates	10, 100 Mbit/s
Ethernet LAN interface type	Fast Ethernet
Supported network protocols	SIP v1, SIP v2, LLDP/CDP/DHCP, OpenVPN, IEEE802.1X, IPv6, FTP/TFTP/HTTP/HTTPS
Volume control	Digital
Number of programmable keys	6
Lines quantity	6 lines
Phonebook capacity	1000 entries
Dual-Tone Multi-Frequency (DTMF) modes	In-band, Out-of band, SIP info
Input frequency	50/60 Hz
AC adapter input voltage	100 - 240 V
AC adapter output current	1.2 A
AC adapter output voltage	5 V
Display diagonal	2.7 \
Display resolution	192 x 64 pixels
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Voice codecs	CNG, G.711Mu, G.711a, G.723.1, G.726, G.729ab, VAD, iLBC
Certification	CE
Cables included	LAN (RJ-45)
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	189 mm
Width	212 mm
Height	175 mm
Package depth	223 mm
Package width	246 mm
Package height	120 mm