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Cisco VISM Installation and Configuration Guide
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Chapter5 CLI Commands
cnft38params
Command Modes VoIP switching/trunking
Usage Guidelines Follow standard CLI procedures for this command.
Examples The following example shows that the T.38 fax transfer parameters for a line number 2 are configured
with a maximum fax transmission rate of 7200 bps, a fax information field s ize of 2 8 bytes, a p rima ry
high-speed data packet size of 20 ms, a low-speed packet transmission r ed und ancy of 3, a h igh- spe ed
packet transmission redundancy of 0, the network TCF verification method, UDP error correction
enabled, NFS code VISM override enabled, a country code of 5 00, a nd a vendo r co de of 4 000 :
tcf-method (Optional) Training check field (TCF) verification method for UDP based fax
transport. It can be one of the following values:
•1 = Local—for TCP-based fax transport or UDP-based fax transport.
The local TCF method implies that the media gateways are actively in v olved
in the training and data rate management procedure, including the ge neration
of the TCF signal. Data rate management is performed by one of the media
gateways on the basis of local results, which are forwarded over the IP
network by the other media gateway. The data rate management gateway
generates the TCF training signal toward its group 3 fax terminal.
•2 = Network—for UDP-based fax transport.
The network TCF method implies that the data rate management is
performed end-to-end between the group 3 fax terminals. The TCF training
signal is passed by the IP network.
err-corr-enable (Optional) Forward error correction scheme for UDP-based fax transport. It can
be one of the following values:
•1 = On (Default)
•2 = Off
nsf-oride-enable (Optional) VISM nonstandard facilities (NSF) code override of NSF,
nonstandard facilities command (NSC), and nonstandard facilities setup (NSS)
T.30 signals. It can be one of the following values:
•1 = On (Default)
If you enable NSF override, the group 3 fax machines are prevented from
synchronizing with each other on the basis of a protocol other than the ITU-T
recommendations.
•2 = Off
If you disable NSF override, the group 3 fax machines synchronize to the
standard T-series protocol.
nsf-ccode (Optional) Country code in the NFS code which identifies the country w he re th e
NFS fax equipment was manufactured, defined as one byte. Refer to ITU T.38 for
a complete description. It can be in the range from 0 t o 655 35. ( Defau lt = 181 )
nsf-vendor (Optional) Vendor code of the NFS fax equipment manufacturer, defined as two
bytes. It can be in the range from 0 to 65535. (Default = 18)