AudioCodes Mediant 800B - Page 470

User's Manual 470 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
Parameter Description
 sends DTMF packets using RFC 2833 payload type according
to the payload type in the received SDP.

expects to receive RFC 2833 packets with the same payload
type as configured by the parameter RFC2833PayloadType.

removes DTMF digits in transparent mode (as part of the voice
stream).
 [5] INFO (Korea) = Sends DTMF digits according to the Korea
Telecom format.
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).
 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.
Second Tx DTMF Option
second-tx-dtmf-option
[IpProfile_SecondTxDtmfOpt
ion]
Defines the second preferred transmit DTMF negotiation method. For
a description, see IpProfile_FirstTxDtmfOption (above).
Note: The corresponding global parameter is SecondTxDTMFOption.
Rx DTMF Option
rx-dtmf-option
[IpProfile_RxDTMFOption]
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.
Gateway Fax and Modem
Fax Signaling Method
fax-sig-method
[IpProfile_IsFaxUsed]
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).
Note:
 Fax adaptations (for options 2 and 3):

Echo Canceller = On

Silence Compression = Off

Echo Canceller Non-Linear Processor Mode = Off
 Dynamic Jitter Buffer Minimum Delay = 40