HPE FlexNetwork MSR Series User Manual

345
One-to-one binding between FXS and FXO voice
subscriber lines
The one-to-one binding between FXS voice subscriber lines and FXO voice subscriber lines
improves the reliability of voice solutions. For industry-specific users, highly reliable communication
over FXS voice subscriber lines is required. That is, dedicated FXO voice subscriber lines can be
used for communication over PSTN when the IP network is unavailable. The one-to-one binding
between FXS voice subscriber lines and FXO voice subscriber lines can meet this requirement.
The one-to-one binding between FXS voice subscriber lines and FXO voice subscriber lines
provides the following functions:
• Dedicated FXO voice subscriber lines—The dedicated FXO voice subscriber lines can be
used only for the bound FXS voice subscriber lines and PSTN-originated calls received over
dedicated FXO voice subscriber lines are directly connected to the bound FXS voice subscriber
lines.
• Consistent state between bound FXS and FXO voice subscriber lines—The
on-hook/off-hook state of the bound FXS and FXO voice subscriber lines is consistent. If an
FXO subscriber line receives a PSTN-originated call when the corresponding FXS voice
subscriber line goes off-hook, the calling party will hear busy tones.
Echo adjustment function
Echo is that the user hearing his own voice in the telephone receiver while he is talking. This is
because analog signals leak into the receiving path of the user. The echo adjustment function
provided by the VoIP gateway can cancel echoes to some extent.
You can cancel echoes in three ways: adjust echo duration, adjust echo cancellation parameters,
and enable the nonlinearity function of echo cancellation.
Adjusting echo duration
Table 270 Adjust echo duration
Symptom Reason Adjustment method
A user hears his or
her voice in
conversation.
The echo duration is so long that the convergence
time of echo cancellation on the network becomes
longer.
Shorten echo duration
The echo duration is so short that long-duration
echoes are not completely cancelled.
Prolong echo duration
Adjusting echo cancellation parameters
Table 271 Adjust echo cancellation parameters
Symptom Parameters adjusted Effect
A user hears his or her voice or
loud background noises from
the peer when speaking.
Speed up the convergence of
comfortable noise amplitudes
Too fast convergence might make
noises uncomfortable.
There are loud environment
noises.
Increase the maximum
amplitude of comfortable
noises.
Too large amplitude might make
noises uncomfortable.

HPE FlexNetwork MSR Series Specifications

General

Brand	HPE
Model	FlexNetwork MSR Series
Category	Network Router
Language	English