AudioCodes Mediant 800 User Manual page 499

CHAPTER 19 Coders and Profiles
Parameter
'Second Tx DTMF Option'
second-tx-dtmf-option
[IpProfile_
SecondTxDtmfOption]
'Rx DTMF Option'
rx-dtmf-option
[IpProfile_RxDTMFOption]
Gateway Fax and Modem
'Fax Signaling Method'
fax-sig-method
[IpProfile_IsFaxUsed]
Mediant 800 Gateway & E-SBC | User's Manual
Description
Note:
■ When out-of-band DTMF transfer is used ([1], [2], [3],
or [5]), the DTMFTransportType parameter is
automatically set to 0 (DTMF digits are removed from
the RTP stream).
■ Digital interfaces: 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
parameter.
■ The corresponding global parameter is
FirstTxDTMFOption.
Defines the second preferred transmit DTMF negotiation
method. For a description, see IpProfile_
FirstTxDtmfOption (above).
Note: The corresponding global parameter is
SecondTxDTMFOption.
Enables the device to declare the RFC 2833 'telephony-
event' parameter in the SDP.
■ [0] Not Supported
■ [3] Supported (default)
The device is always receptive to RFC 2833 DTMF relay
packets. Thus, it is always correct to include the
'telephony-event' parameter by 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, set the parameter to
0.
Note: The corresponding global parameter is
RxDTMFOption.
Defines the SIP signaling method for establishing and
transmitting a fax session when the device detects a fax.
■ [0] No Fax = (Default) No fax negotiation using SIP
signaling. The fax transport method is according to the
FaxTransportMode parameter
■ [1] T.38 Relay = Initiates T.38 fax relay.
■ [2] G.711 Transport = Initiates fax/modem using the
coder G.711 A-law/Mu-law with adaptations (see Note
below).
■ [3] Fax Fallback = Initiates T.38 fax relay. If the T.38
negotiation fails, the device re-initiates a fax session
using the coder G.711 A-law/Mu-law with adaptations
(see the Note below).
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