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74 TAU-72.IP/TAU-36.IP Universal Network Terminal
G.711U RFC3108—use G.711U codec to transfer data via modem connection. When
entering modem data transfer mode via SIP protocol, echo cancellation and VAD are
disabled with attributes described in RFC3108 recommendation:
a=silenceSupp:off - - - -
a=ecan:fb off -;
G.711A NSE—CISCO NSE support, G.711A codec is used to transfer data via modem
connection.
G.711U NSE—CISCO NSE support, G.711U codec is used to transfer data via modem
connection.
Cisco NSE support: when NSE 192 packet is received, gateway will switch to the selected codec
and disable VAD; when NSE 193 packet is received, echo canceller will be disabled.
—
RFC2833 PT
—type of payload used to transfer packets via RFC2833. Permitted values: 96 to 127.
RFC2833 recommendation describes the transmission of DTMF and Flash tones via RTP protocol.
This parameter should conform to the similar parameter of a communicating gateway.
—
Decoding rfc2833 with PT from answer SDP
—when performing outgoing call, receive DTMF tones
in rfc2833 format with payload type proposed by a communicating gateway. When unchecked,
tones will be received with the payload type, configured on the gateway. Enables compatibility
with gateways that incorrectly handle rfc3264 recommendation.
—
Silence suppression
—when checked, use voice activity detector (VAD) and silence suppression
(SSup), otherwise they will not be used. Voice activity detector disables transmission of RTP
packets during periods of silence, reducing loads in data networks.
—
Echo canceller
—when checked, use echo cancellation (tail length is up to 128ms).
—
NLP disable
—when checked, use echo cancellation with disabled non-linear processor (NLP).
When signal levels on transmission and reception significantly differ, useful signal may become
suppressed by the NLP. Use this echo canceller operation mode to prevent the signal suppression.
—
Comfort noise
—when checked, use comfort noise generator. Used together with 'Silence
compression (VAD)' setting, as comfort noise packets are generated only upon voice pauses
detection.
In
'RTCP configuration'
section, you may configure basic settings for device operation via RTCP protocol:
—
RTCP timer
—time period in seconds (5-65535), after which the device send control packets via
RTCP protocol. When unchecked, RTCP will not be used.
—
RTCP control period
—control function of a voice frequency path status. Defines the period of time
(RTCP timer), during which the opposite side will wait for RTCP protocol packets. When there is no
packets in the specified period of time, established connection will be terminated due to loss of
connection—cause 3 no route to destination. Control period value is calculated using the
following equation: RTCP timer* RTCP control period, seconds. When unchecked, control feature
will be disabled.
—
RTCP-XR
—when checked, generate 'RTCP Extended Reports' control packets according to RFC