Version 5.8 267 September 2009
SIP User's Manual 6. Configuration Parameters Reference
Parameter Description
DTMF Parameters
Web: Declare RFC 2833 in SDP
EMS: Rx DTMF Option
[RxDTMFOption]
Defines the supported Receive DTMF negotiation method.
[0] No = Don't declare RFC 2833 telephony-event
parameter in SDP.
[3] Yes = Declare RFC 2833 telephony-event parameter
in SDP (default).
The device is designed to always be receptive to RFC 2833
DTMF 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.
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 IETF
<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 twice for configuring the DTMF transmit
methods.
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