NB3000-Line-Hd User Manual 4.2
Parameter
Voice Gateway Administration Settings
SIP register expires
Specifies the registration interval in seconds
In case you are running multiple WWAN interfaces sharing the same SIM, please bear in
mind that the system may switch SIMs during operation which will also result in different
settings for voice communication.
Voice Endpoints
On this page you can activate the endpoints used for voice communication, the following
types are supported:
Parameter
Voice Gateway Endpoint Types
Voice-Over-Mobile
Endpoint for GSM/UMTS/LTE calls (can be used for calls to mo-
bile or landline phones)
SIP (registrar)
SIP endpoint which can be a client registered to our registrar
SIP (direct)
Endpoint for calls directly routed to a SIP agent without regis-
tration
SIP (user-agent)
Endpoint acting as SIP user agent towards a remote registrar
Based on your equipment, we recommend to adjust the modem’s audio profile for a better
sound experience. The following profiles are available:
Parameter
Voice-Over-Mobile Audio Profiles
Handset
Provides a mild echo, short delay (less than 16-ms dispersion).
This mode is intended for use with a well-designed handset,
where the Echo Return Loss (ERL) is generally high. Full-duplex
performance is easiest to achieve in this mode.
Headset
Provides a moderate echo, short delay (less than 16-ms dis-
persion).
This mode is intended for use in situations where the echo
may be loud but low in delay. There are a variety of different
headsets available with a wide variety of echo characteristics
and noise pickup. Although the echo delay is typically short (<
16 ms) with all headsets, the echo return loss characteristics
can vary significantly and are not well known a priori to the
handset designer. This mode is more robust and more aggres-
sive at echo cancellation.
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