Enabling Ecm For Fax - 3Com MSR 50 Series Configuration Manual

Enabling ECM for Fax

FoIP configuration includes:
"Enabling ECM for Fax" on page 2345
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"Configuring Fax Capability Transmission Mode" on page 2346
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"Configuring Maximum Fax Rate" on page 2346
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"Configuring Fax Training Mode" on page 2347
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"Configuring a Fax Local Training Threshold" on page 2348
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"Configuring Transmit Energy Level of Gateway Carrier" on page 2348
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"Configuring Fax Interworking Protocol" on page 2349
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"Configuring T.38 Capability Description Compatibility" on page 2350
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"Configuring Default Values of Fax Parameters Globally" on page 2351
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As defined in ITU-T, the error correction mode (ECM) is required for a half duplex
and fax message transmission using the half-duplex and half-modulation system
of ITU-T V.34 protocol. Besides, the G3 fax terminals working in full duplex mode
are required to support half-duplex mode, namely, ECM.
The fax machines using ECM can correct errors, provide the automatic repeat
request (ARQ) function, and transmit fax packets in the format of HDLC frames.
On the contrary, the fax machines using non-ECM cannot correct errors and they
transmit fax packets in the format of binary strings.
In the case that fax machines on two sides support ECM, non-ECM will be used if
the gateway is configured with non-ECM. Non-ECM will also be adopted if either
of the fax machines does not support ECM. ECM can be adopted only if fax
machines on both sides support ECM and the gateway is configured with ECM.
You must enable ECM mode for the POTS and VoIP entities corresponding to the
fax sender and receiver in ECM mode.
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 ECM for fax:
To do...
Enter system view
Enter voice view
Enter voice dial program view dial-program
Enter voice entity view
Enable ECM for fax
Use the command...
system-view
voice-setup
entity entity-number { pots |
voip }
fax ecm
FoIP Configuration 2345
Remarks
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Required
By default, ECM is disabled
on the gateway.