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SMG digital gateway
DSCP for RTP
—a service type (DSCP) for RTP and UDPTL (T.38) packets.
RTP-loss timeout
—a function to control voice frequency path status by monitoring the presence of
RTP traffic from the communicating device. The range of permitted values is from 10 to
300 seconds. When unchecked, RTP control is disabled; enabled when checked. The following
control is performed: if there are no RTP packets coming from the opposite device for the
duration of the timeout interval and the last packet was not a silence suppression packet, the call
is cleared back.
RTP-loss timeout after Silence-Suppression Indication (multiplier)
—the RTP packet timeout for the
silence suppression option. The range of permitted values is from 1 to 30. The coefficient is a
multiplier that determines how many times the value of this timeout is larger than the
RTP Packet
Timeout
value. The following control is performed: if there are no RTP packets coming from the
opposite device for the duration of this time interval and the last packet was a silence suppression
packet, the call is cleared back.
RTCP period (sec.)
—time period in seconds (5–65,535), after which the device sends control
packets via the RTCP protocol. When unchecked, RTCP is not used.
RTCP activity control
—a function to control voice frequency path status; may take values from 5
to 65,535 seconds. The number of time periods (
RTCP timer
) to wait for RTCP protocol packets
from the opposite party. If no packets received during the specified period of time, the
established connection is terminated. At that,
"cause 3 no route to destination
" is set as a cause of
the disconnection to the TDM and IP protocols. The control period is calculated from the following
expression:
RTCP timer * RTCP control period
(seconds). When unchecked, the feature is disabled.
Clear Channel
—a channel that is established for transparent transfer of digital data; when the
channel is established, the device does not attempt to recode it that ensures transparent
transmission. To establish a connection of this kind, the
Transmission Medium Requirement
field is
required with the following values:
–
restricted digital info (Q.931 protocol);
–
unrestricted dig.info (Q.931 protocol);
–
video (Q.931 protocol);
–
64 kbit/s unrestricted (SS-7 protocol).
Clear Channel override—
when checked, only one CLEARMODE codec is specified while
establishing a clear channel in SDP if operation via Clear Channel is invoked on the first call leg.
When unchecked, the complete list of selected codecs is transferred to SDP in the priority order.
DTMF Transmission
DTMF transport
— the method of DTMF
transmission via IP network:
–
inband
—in RTP packets, in-band;
–
rfc2833
—in RTP packets according to
rfc2833 recommendations;
–
info
—out-of-band. The SIP protocol uses INFO messages; the type of DTMF signals
transferred depends on the MIME extension type in this case.
To use extension dialling during a call, make sure the similar DTMF tone transmission method
is configured in the opposite gateway.
Flash signal processing
(
RFC2833
)—processing of the FLASH signals received according to RFC2833
method.
RFC2833 PT
—the type of dynamic load used to transfer DTMF packets via RFС2833. The range of
permitted values is from 96 to 127. RFC2833 recommendation defines the transmission of DTMF