HP FlexNetwork MSR Series Configuration Manual page 286

You can implement the fax pass-through function on the voice gateway (router) in the following ways:
•
Configure the fax to work in the pass-through mode on both sides.
•
Negotiate the codec as G.711 and set the fax rate to disable on both sides. Then, disable the
VAD function to avoid fax failures. This method is used for the voice gateway to interwork with
other devices in the pass-through mode.
To configure the pass-through mode:
Step
1. Enter system view.
2. Enter voice view.
3. Enter voice dial program
view.
4. Enter voice entity view.
5. Configure the fax
pass-through mode.
Configuring the SIP modem pass-through function
The SIP modem pass-through function is mainly used for remote device management. Since the
VoIP network has replaced part of the traditional PSTN, VoIP devices are required to support the
modem pass-through function, which can help remote PSTN users to log in to internal network
devices through dialup.
To configure the SIP Modem pass-through function:
Step
1. Enter system view.
2. Enter voice view.
3. Enter voice dial
program view.
4. Enter voice entity
view.
5. Configure the codec
type and switching
mode for SIP modem
pass-through
function.
Command
system-view
voice-setup
dial-program
entity entity-number { pots |
voip }
fax protocol pcm { g711alaw |
g711ulaw }
Command
system-view
voice-setup
dial-program
entity entity-number { pots | voip }
modem protocol pcm { standard |
nte-compatible } { g711alaw | g711ulaw }
273
Remarks
N/A
N/A
N/A
N/A
Optional.
Pass-through mode is disabled for fax
by default.
If the call control protocol is SIP, this
command can be used only for the
originator of the fax request (using
private T.38, standard T.38, or fax
pass-through protocol). When a fax
request is originated using private
T.38, standard T.38, or fax
pass-through protocol, the fax type is
decided according to the
configurations. The receiver of the fax
request responds to the originator
based on the type of the fax request,
and then establishes a fax call.
Remarks
N/A
N/A
N/A
N/A
Optional.
By default, the SIP modem
pass-through function is not
configured.