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

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• 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:
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. Configure the fax
pass-through mode.
fax protocol pcm { g711alaw |
g711ulaw }
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.
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:
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. Configure the codec
type and switching
mode for SIP modem
pass-through function.
modem protocol pcm { standard |
nte-compatible } { g711alaw | g711ulaw }
Optional.
By default, the SIP modem
pass-through function is not
configured.