Enabling Ecm For Fax - HP FlexNetwork MSR Series Configuration Manual

Step
6. Configure the NTE
payload type for the
NTE
compatible-switching
mode.
Enabling CNG fax switchover
Configuration prerequisites
•
VoIP configuration is completed, IP calls can be made successfully, and fax machines are
connected correctly.
•
The configuration on the XE 7000 is completed and the fax mailbox function is enabled.
Configuration procedure
The calling tone (CNG) fax switchover is used to implement the fax mailbox service through
communication with the XE 7000 device. When the local fax machine A originates a fax call to the
peer fax machine B, if B is busy or is unattended, A can send the fax call to the fax mailbox of the XE
7000. With CNG fax switchover enabled, the voice gateway can switch to the fax mode once it
receives a CNG from A.
To enable CNG fax switchover:
Step
1. Enter system view.
2. Enter voice view.
3. Enter voice dial
program view.
4. Enter voice entity
view.
5. Enable CNG fax
switchover.

Enabling ECM for fax

As defined in ITU-T, the error correction mode (ECM) is required by the half-duplex and
half-modulation system running ITU-T V.34 protocol for fax message transmission. Besides, the G3
fax terminals working in full duplex mode are required to support half-duplex mode, that is, 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. Fax machines using non-ECM
cannot correct errors and they transmit fax packets in the format of binary strings.
To use ECM fax machines on both sides, the gateway must support ECM.
Enable ECM mode for the POTS and VoIP entities corresponding to the fax sender and receiver in
the ECM mode.
Configuration prerequisites
VoIP configuration is completed, IP calls can be made successfully, and fax machines are connected
correctly.
Command
modem compatible-param payload-type
Command
system-view
voice-setup
dial-program
entity entity-number { pots | voip }
fax cng-switch enable
274
Remarks
Optional.
By default, the value of the
NTE payload type is 100.
This command is valid only
for the NTE-compatible
switching mode.
Remarks
N/A
N/A
N/A
N/A
Disabled by default.