Configuring Fax Capability Transmission Mode; Configuring Maximum Fax Rate - 3Com MSR 50 Series Configuration Manual

2346 C 135: F
HAPTER AX OVER
Configuring Fax
Capability Transmission
Mode
Configuring Maximum
Fax Rate
IP C
ONFIGURATION
In common fax applications, the participating fax terminals negotiate with the
standard capability (such as V.17 and V.29 rate) by default. It means that they do
not send each other non-standard facilities (NSF) message frames. In some cases
such as encrypted fax, both facsimile terminals adopt NSF to negotiate.
At the start of negotiation, both terminals first exchange NSF message frames, and
then negotiate the subsequent fax capability for communication. NSF messages
are standard T.30 messages and carry private information.
In order to use NSF for negotiation, the following conditions must be satisfied:
Fax terminals must support nonstandard transmission mode.
■
The signal transmission mode of the fax capability must be set to a
■
nonstandard mode in the POTS and VoIP entities for both fax terminals.
Configuration prerequisites
VoIP configuration is completed, IP calls can be made successfully, and fax
machines are connected correctly.
Configuration procedure
Follow these steps to configure fax capability transmission mode:
To do...
Enter system view
Enter voice view
Enter voice dial program
view
Enter voice entity view
Configure the signal
transmission mode of fax
capability
You can configure the maximum fax rate according to the fax protocols. If the
baud rate is set to a value other than "disable" and "voice", the fax rate is
negotiated between the two values respectively corresponding to the baud rate
and the voice coding and decoding rate. The smaller value will be adopted as the
allowed maximum fax rate, but not the actual fax rate.
If "voice" mode is adopted, the allowed maximum fax rate will be first
determined in accordance with voice coding/decoding protocols.
If G.711 is used, the fax rate will be 14400 bps and the corresponding fax
■
protocol is V.17.
If G.723.1 Annex A is used, the fax rate will be 4800 bps and the
■
corresponding fax protocol is V.27.
If G.726 is adopted, the fax rate will be 14400 bps and the corresponding fax
■
protocol is V.17.
Use the command...
system-view
voice-setup
dial-program
entity entity-number { pots |
voip }
fax nsf-on
Remarks
-
-
-
-
Required
By default, a standard mode
is adopted for fax capability
transmission.