Media5 Mediatrix 4104, Reference Manual, Page: 259 / 466

DTMF Transport Type Reference Manual (SIP Version)
Mediatrix 4104 237
DTMF – RFC 2833 Events
You can define which events will be relayed via RFC 2833. This could be very useful in a Remote Line
Extension scenario, as described in
“Remote Line Extension” on page 325 .

To define the DTMF enforce default events:
1. In the voiceIfMIB , set the DTMF enforce default events in the voiceIfDtmfEnforceDefaultEvents
variable.
DTMF Transport over the SIP Protocol
You can select the method used to transport DTMFs out-of-band over the SIP protocol.
This feature is effective only if the voiceIfDtmfTransport variable is set to outOfBandUsingSignalingProtocol
(see “DTMF Transport Type” on page 235 for more details).

To select the DTMF transport method over the SIP protocol:
1. In the voiceIfMIB , set the DTMF transport type in the voiceIfDtmfTransport variable to
outOfBandUsingSignalingProtocol .
2. In the sipInteropMIB , set the DTMF transport type in the sipInteropDtmfTransportMethod variable
( sipInteropDtmfTransportBySipProtocol group).
The following methods are available:
Standards Supported • RFC 2833: RTP Payload for DTMF Digits, Telephony Tones
and Telephony Signals
Table 151: DTMF Enforce Default Events
Parameter Description
enable Conformance is enforced and support for RFC 2833 implies the support of basic
telephony-events. When setting the variable
voiceIfDtmfTransport to
outOfBandUsingRtp ( “DTMF Transport Type” on page 235 ), or the variable
telephonyAttributesHookFlashProcessing to outOfBandUsingRtp ( “Hook Flash
Processing” on page 322 ), the Mediatrix 4104 will advertise the support for events
0-15; it will assume support for events 0-15 when support for RFC 2833 is received
in an announcement.
disable This creates a deliberate deviance to RFC 2833 as support of basic events is not
automatic. The variables
voiceIfDtmfTransport and
telephonyAttributesHookFlashProcessing then act independently to specify which
events will be relayed via RFC 2833. If Hook Flash relay is enabled by itself, support
of event 16 alone will be advertised; if both Hook Flash and DTMF relay are
activated, events 0-16 are supported.
Standards Supported • draft-choudhuri-sip-info-digit-00.txt
Table 152: DTMF Out-of-Band Transport Methods
Method Description
draftChoudhuriSipInfoDigit00 Transmits DTMFs by using the method defined in draft-
choudhuri-sip-info-digit-00 . Only the unsolicited-digit part is
supported.