AudioCodes MEDIAPACK VERSION 6.2 Manuel d'utilisateur Page 174

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MediaPack SIP
MediaPack SIP User’s Manual 174 Document #: LTRT-65405
5. Sending DTMF digits (in RTP packets) as part of the audio stream (DTMF Relay is disabled):
Note that this method is normally used with G.711 coders; with other LBR coders the quality
of the DTMF digits is reduced.
To ser this mode:
¾ ‘IsDTMFUsed’ = 0 (Use Out-of-Band DTMF = No)
¾ ‘TxDTMFOption’ = 0 (DTMF RFC 2833 Negotiation = Disable)
¾ ‘RxDTMFOption = 0’ (Declare RFC 2833 in SDP = Yes)
¾ ‘DTMFTransportType = 2’ (DTMF Transport Type = Transparent DTMF)
Note 1: The gateway is always ready to receive DTMF packets over IP, in all
possible transport modes: INFO messages, NOTIFY and RFC 2833 (in
proper payload type) or as part of the audio stream.
Note 2: To exclude RFC 2833 Telephony event parameter from the gateway’s SDP,
set ‘RxDTMFOption = 0’ in the ini file.
The following parameters affect the way the MediaPack SIP handles the DTMF digits:
Table
8-1: Summary of DTMF configuration Parameters (continues on pages 174 to 175)
ini File Field Name
[Web Name]
Valid Range and Description
IsDTMFUsed
[Use Out-of-Band DTMF]
Use out-of-band signaling to relay DTMF digits.
No [0] = DTMF digits are sent inband (default).
Yes [1] = DTMF digits are sent out-of-band according to the parameter ‘Out-of-band
DTMF format’.
Note: When out-of-band DTMF transfer is used, the parameter ‘DTMF Transport Type’ is
automatically set to 0 (erase the DTMF digits from the RTP stream).
OutOfBandDTMFFormat
[Out-of-Band DTMF Format]
The exact method to send out-of-band DTMF digits.
INFO (Nortel) [1] = Sends DTMF digits according with IETF <draft-choudhuri-sip-
info-digit-00>.
INFO (Cisco) [2] = Sends DTMF digits according with Cisco format (default).
NOTIFY (3Com) [3] = NOTIFY format <draft-mahy-sipping-signaled-digits-01.txt>.
Note 1: To use out-of-band DTMF, set ‘IsDTMFUsed=1’.
Note 2: When using out-of-band DTMF, the ‘DTMFTransportType’ parameter is
automatically set to 0, to erase the DTMF digits from the RTP stream.
TxDTMFOption
[DTMF RFC 2833
Negotiation]
Disable [0] = No negotiation, DTMF digit is sent according to the parameters ‘DTMF
Transport Type’ and ‘RFC2833PayloadType’ (default).
Enable [4] = Enable RFC 2833 payload type (PT) negotiation
Note 1: This parameter is applicable only if ‘IsDTMFUsed=0’ (out-of-band DTMF is not
used).
Note 2: If enabled, the gateway:
Negotiates RFC 2833 payload type using local and remote SDPs.
Sends DTMF packets using RFC 2833 PT according to the PT in the received SDP.
Expects to receive RFC 2833 packets with the same PT as configured by the
‘RFC2833PayloadType’ parameter.
Note 3: If the remote party doesn’t include the RFC 2833 DTMF relay payload type in the
SDP, the gateway uses the same PT for send and for receive.
Note 4: If TxDTMFOption is set to 0, the RFC 2833 payload type is set according to the
parameter ‘RFC2833PayloadType’ for both transmit and receive.
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