
Version 5.6 127 November 2008
SIP User's Manual 3. Web-Based Management
Parameter Description
relay packets. Therefore, it is always correct to include the 'telephony-
event' parameter as default in the SDP. However, some devices use
the absence of the 'telephony-event' in the SDP to decide to send
DTMF digits in-band using G.711 coder. If this is the case, you can set
RxDTMFOption to 0.
1
st
to 5
th
Tx DTMF Option
[TxDTMFOption]
Determines a single or several preferred transmit DTMF negotiation
methods.
[0] Not Supported = No negotiation - DTMF digits are sent
according to the parameters DTMFTransportType and
RFC2833PayloadType (default).
[1] INFO (Nortel) = Sends DTMF digits according to IETF <draft-
choudhuri-sip-info-digit-00>.
[2] NOTIFY = Sends DTMF digits according to <draft-mahy-
sipping-signaled-digits-01>.
[3] INFO (Cisco) = Sends DTMF digits according to Cisco format.
[4] RFC 2833.
[5] INFO (Korea) = Sends DTMF digits according to Korea
Telecom format.
Notes:
DTMF negotiation methods are prioritized according to the order of
their appearance.
When out-of-band DTMF transfer is used ([1], [2], [3], or [5]), the
parameter DTMFTransportType is automatically set to 0 (DTMF
digits are erased from the RTP stream).
When RFC 2833 (4) is selected, the device:
1) Negotiates RFC 2833 Payload Type (PT) using local and remote
SDPs.
2) Sends DTMF packets using RFC 2833 PT according to the PT in
the received SDP.
3) Expects to receive RFC 2833 packets with the same PT as
configured by the parameter RFC2833PayloadType.
4) Sends DTMF digits in transparent mode (as part of the voice
stream).
When TxDTMFOption is set to 0, the RFC 2833 PT is set according
to the parameter RFC2833PayloadType for both transmit and
receive.
The ini file table parameter TxDTMFOption can be repeated 5
times for configuring the DTMF transmit methods.
RFC 2833 Payload Type
[RFC2833PayloadType]
The RFC 2833 DTMF relay dynamic payload type.
The valid range is 96 to 99, and 106 to 127. The default is 96. The
100, 102 to 105 range is allocated for proprietary usage.
Notes:
Certain vendors (e.g., Cisco) use payload type 101 for RFC 2833.
When RFC 2833 payload type (PT) negotiation is used (the
parameter TxDTMFOption is set to 4), this payload type is used for
the received DTMF packets. If negotiation isn't used, this payload
type is used for receive and for transmit.
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