Audio Features
393
The IP phones will not send DTMF sequence when the call is placed on hold or is held.
Transmitting DTMF Digit
Three methods of transmitting DTMF digits on SIP calls:
RFC 2833 -- DTMF digits are transmitted by RTP Events compliant with RFC 2833. You can configure
the payload 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.
INBAND -- DTMF digits are transmitted in the voice band. It uses the same codec as your voice and
is audible to conversation partners.
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.
It configures the DTMF type.
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.
Account->Advanced->DTMF Type
account.X.dtmf.dtmf_payload
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