Yealink SIP-T2XP Administrator's Manual page 264

Administrator's Guide for SIP-T2xP IP Phones
DTMF (Dual Tone Multi-frequency), better known as touch-tone, is used for
telecommunication signaling over analog telephone lines in the voice-frequency band.
DTMF is the signal sent from the IP phone to the network, which is generated when
pressing the IP phone's keypad during a call. Each key pressed on the IP phone
generates one sinusoidal tone of two frequencies. One is generated from a high
frequency group and the other from a low frequency group.
The DTMF keypad is laid out in a 4× 4 matrix, with each row representing a low
frequency, and each column representing a high frequency. Pressing a digit key (such
as '1') will generate a sinusoidal tone for each of two frequencies (697 and 1209 hertz
(Hz)).
DTMF Keypad Frequencies:
697 Hz
770 Hz
852 Hz
941 Hz
Three methods of transmitting DTMF digits on SIP calls:
RFC 2833 -- DTMF digits are transmitted by RTP Events compliant to RFC 2833.

INBAND -- DTMF digits are transmitted in the voice band.

SIP INFO -- DTMF digits are transmitted by SIP INFO messages.

The method of transmitting DTMF digits is configurable on a per-line basis.
RFC 2833
DTMF digits are transmitted using the RTP Event packets that are sent along with the
voice path. These packets use RFC 2833 format and must have a payload type that
matches what the other end is listening for. The payload type for RTP Event packets is
configurable. IP phones default to 101 for the payload type, which use the definition to
negotiate with the other end during call establishment.
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.
INBAND
DTMF digits are transmitted within the audio of the IP phone conversation. It uses the
246
1209 Hz 1336 Hz
1 2
4 5
7 8
* 0
1447 Hz 1633 Hz
3 A
6 B
9 C
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