R2511-HP MSR Router Series Voice Configuration Guide(V5)

276
Ste
p
Command Remarks
6. Configure the NTE
payload type for the
NTE
compatible-switching
mode.
modem compatible-param payload-type
Optional.
By default, the value of the
NTE payload type is 100.
This command is valid only 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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter voice view.
voice-setup N/A
3. Enter voice dial
program view.
dial-program N/A
4. Enter voice entity
view.
entity entity-number { pots | voip } N/A
5. Enable CNG fax
switchover.
fax cng-switch enable Disabled by default.
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.