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Administrator's Guide for SIP-T58V/T58A/T56A/CP960 IP Phones
1209 Hz 1336 Hz 1477 Hz 1633 Hz
852 Hz
7
8
941 Hz
*
0
Note
The 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
l
type and sending times of the end RTP Event packet. The RTP Event packet contains 4 bytes. The 4 bytes are dis-
tributed 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
l
conversation partners.
SIP INFO -- DTMF digits are transmitted by SIP INFO messages. DTMF digits are transmitted by the SIP INFO mes-
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sages when the voice stream is established after a successful SIP 200 OK-ACK message sequence. The SIP INFO mes-
sage 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
Description 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.
Permitted
2-SIP INFO, DTMF digits are transmitted by the SIP INFO messages.
Values
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
It configures the value of DTMF payload.
Description
Note: It works only if "account.X.dtmf.type" is set to 1 (RFC2833) or 3 (RFC2833 + SIP INFO).
Permitted
Integer from 96 to 127
Values
Default
101
294
9
C
#
D
[1]
[1]
<MAC>.cfg
<MAC>.cfg
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