AudioCodes Mediant 800B - Page 471

Version 7.2 471 Mediant 800B Gateway & E-SBC
User's Manual 20. Coders and Profiles
Parameter Description
 Dynamic Jitter Buffer Optimization Factor = 13
 If the device initiates a fax session using G.711 (option 2 or 3), a
'gpmd' attribute is added to the SDP in the following format:

For A-law: 'a=gpmd:8 vbd=yes;ecan=on'

For Mu-law: 'a=gpmd:0 vbd=yes;ecan=on'
 When the parameter is set to 1, 2, or 3, the parameter
FaxTransportMode is ignored.
 When the parameter is set to 0, T.38 might still be used without the
control protocol's involvement. To completely disable T.38, set
FaxTransportMode to a value other than 1.
 For more information on fax transport methods, see Fax/Modem
Transport Modes on page 194.
 The corresponding global parameter is IsFaxUsed.
CNG Detector Mode
cng-mode
[IpProfile_CNGmode]
Enables the detection of the fax calling tone (CNG) and defines the
detection method.
 [0] Disable = (Default) The originating fax does not detect CNG; the
device passes the CNG signal transparently to the remote side.
 [1] Relay = The originating fax detects CNG. The device sends
CNG packets to the remote side according to T.38 (if IsFaxUsed is
set to 1) and the fax session is started. A SIP Re-INVITE message
is not sent and the fax session starts by the terminating fax. This
option is useful, for example, when the originating fax is located
behind a firewall that blocks incoming T.38 packets on ports that
have not yet received T.38 packets from the internal network (i.e.,
originating fax). To also send a Re-INVITE message upon
detection of a fax CNG tone in this mode, set the parameter
FaxCNGMode to 1 or 2.
 [2] Event Only = The originating fax detects CNG and a fax session
is started by the originating fax, using the Re-INVITE message.
Typically, T.38 fax session starts when the preamble signal is
detected by the answering fax. Some SIP devices do not support
the detection of this fax signal on the answering fax and thus, in
these cases, it is possible to configure the device to start the T.38
fax session when the CNG tone is detected by the originating fax.
However, this mode is not recommended.
Note: The corresponding global parameter is CNGDetectorMode.
Vxx Modem Transport Type
vxx-transport-type
[IpProfile_VxxTransportType
]
Defines the modem transport type.
 [-1] = (Not Configured) The settings of the global parameters are
used:

V21ModemTransportType

V22ModemTransportType

V23ModemTransportType

V32ModemTransportType

V34ModemTransportType
 [0] Disable = Transparent.
 [2] Enable Bypass (Default)
 [3] Events Only = Transparent with Events.
For a detailed description of the parameter per modem type, see the
relevant global parameter (listed above).
NSE Mode Enables Cisco's compatible fax and modem bypass mode, Named