User`s manual

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.