SMG digital gateway
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Options of SIP-session timers (RFC 4028) will be enabled by default in 'Transit E1' mode if the values
are not set before.
4.1.7.6
RTP Codec Configuration Tab
Options
Voice activity detector / Comfort noise generator (VAD/CNG)
—when checked, enables a silence
detector and a comfort noise generator. The voice activity detector allows transmission of RTP
packets to be disabled during periods of silence, thus reducing the load in data networks.
Source IP: Port verification
—when checked, controls media traffic received from the IP address
and UDP port specified in the SDP communication session description; otherwise, accepts traffic
from any IP address and UDP port.
Echo cancellation
—the echo cancellation mode:
–
voice(default)
—echo cancellers are enabled in the voice data transmission mode;
–
voice nlp-off
—echo cancellers are enabled in the voice mode; the non-linear processor
(NLP) is disabled. When the levels of transmission and reception signals significantly differ,
a weak signal may be suppressed by the NLP. This echo canceller mode is used to prevent
the signal suppression;
–
modem
—echo cancellers are enabled in the modem operation mode (direct component
filtering is disabled, NLP control is disabled, CNG is disabled);
–
off
—echo cancellation is disabled (this mode is set by default).
Rx gain (0.1 dB)
—volume of the signal received, gain of the signal received from the
communicating gateway.
Tx gain (0.1 dB)
—volume of the signal transmitted, gain of the signal transmitted in the
communicating gateway direction.