Yealink SIP-T40G 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-T40G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Wall mountable	Yes
Wi-Fi	No
Security algorithms	AES, HTTPS, SSL/TLS
Networking standards	IEEE 802.3af
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	FTP, TFTP, HTTP, HTTPS
Voice codecs	G.711, G.711a, G.711u, G.722, G.726, G.729ab
RJ-11 ports quantity	1
Ethernet LAN (RJ-45) ports	2
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	1.6 W
Certification	CE, FCC, ISO 9001
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 90 %
Volume control	Digital
Display diagonal	2.3 \
Display resolution	132 x 64 pixels
Lines quantity	3 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	3
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	175 mm
Width	212 mm
Height	54 mm