Version 6.2 747 February 2011
SIP User's Manual 12. Configuration Parameters Reference
Parameter Description
Note: This parameter can also be configured per IP Profile,
using the IPProfile parameter (see ''Configuring IP Profiles'' on
page 143).
Web/EMS: 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
Internet-Draft draft-choudhuri-sip-info-digit-00.
[2] NOTIFY = Sends DTMF digits according to IETF
Internet-Draft 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:
a. Negotiates RFC 2833 payload type using local and
remote SDPs.
b. Sends DTMF packets using RFC 2833 payload type
according to the payload type in the received SDP.
c. Expects to receive RFC 2833 packets with the same
payload type as configured by the parameter
RFC2833PayloadType.
d. Removes DTMF digits in transparent mode (as part of
the voice stream).
When TxDTMFOption is set to 0, the RFC 2833 payload
type is set according to the parameter
RFC2833PayloadType for both transmit and receive.
If an ISDN phone user presses digits (e.g., for interactive
voice response / IVR applications such as retrieving voice
mail messages), ISDN Information messages received by
the device for each digit are sent in the voice channel to
the IP network as DTMF signals, according to the settings
of the TxDTMFOption parameter.
The ini file table parameter TxDTMFOption can be
repeated twice for configuring the DTMF transmit methods.
This parameter can also be configured per IP Profile, using
the IPProfile parameter (see ''Configuring IP Profiles'' on
page 143).
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