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Universal Network Terminal TAU-32M.IP 147
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 selected, echo cancellation is used;
–
Dispersion time
–echo signal, appearing with a delay of no more than the given value, will be jammed (up to
128 ms);
–
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;
Cisco NSE configuration
In
'Cisco NSE configuration'
section, you may configure codec payload type for modem transmission using
CISCO NSE method:
–
NSE PT
–type of payload used to transfer packets via NSE. Permitted values: 96 to 127.
Т38 configuration
In
'Т38 configuration'
section, you may configure Т.38 protocol parameters:
–
Max Datagram Size
–maximum datagram size. (Zero value means that T38MaxDatagram attribute will not
be transferred via SIP, and the gateway will support the reception of datagrams up to 512bytes. Use zero
value in interactions with gateways that do not support datagrams from 272bytes and higher). This
parameter defines the maximum quantity of bytes that will be sent in T.38 protocol packet;
–
Bitrate
– maximum fax transfer rate (9600, 14400). This setting affects the ability of a gateway to work with
high-speed fax units. If fax units support data transfer at 14400 baud, and the gateway is configured to
9600 baud, the maximum speed of connection between fax units and the gateway will be limited at 9600
baud. And vice versa, if fax units support data transfer at 9600 baud, and the gateway is configured to
14400 baud, this setting will not affect the interaction, maximum speed will be defined by the performance
of fax units.
Jitter buffer configuration