SMG digital gateway 75
via the RTP protocol. This parameter should conform to the similar parameter of the
communicating gateway (the most frequently used values are 96, 101).
RFC2833: same PT—when checked, if SMG is the party which sends "offer SDP", RFC2833 packets
are expected for reception with a PT value sent in "answer SDP"; otherwise, RFC2833 packets are
expected for reception with the same PT value as sent by SMG "offer SDP".
DTMF MIME Type—the load type used for DTMF transmission in SIP protocol INFO packets:
– application/dtmf-relay—in SIP INFO application/dtmf-relay packets ("*" and "#" are sent
as symbols "*" and "#");
– application/dtmf—in SIP INFO application/dtmf packets ("*" and "#" are sent as digits 10
and 11).
Jitter Buffer settings
Mode—the mode of jitter buffer operation: fixed
or adaptive.
Minimum size, ms—the size of a fixed jitter buffer
or the lower limit (minimum size) of an adaptive
jitter buffer. The range of permitted values is
from 0 to 200 ms.
Initial size, ms—an initial value of the adaptive
jitter buffer. The range of permitted values is
from 0 to 200 ms.
Maximum size, ms—the upper limit (maximum
size) of the adaptive jitter buffer, in milliseconds.
The range of permitted values is from "minimum
size" to 200 ms.
Adaptation period, ms—the time of buffer adaptation to the lower limit without faults in packet
sequence order.
Removal mode—the mode of buffer adaptation. Defines the method of packet deletion during
buffer adaptation to the lower limit.
– Soft—the device uses an intelligent selection pattern to delete the packets, which exceed
the threshold.
– Hard—the packets, which delay exceeds the threshold, are deleted immediately.
Removal threshold, ms—a threshold for immediate deletion of a packet, in milliseconds. When
buffer size grows and packets delay exceeds this threshold, the packets are deleted immediately.
The range of permitted values is from "Delay max" to 500 ms.
Adjustment mode—the adjustment mode selected for increase of the adaptive jitter buffer
(gradual/instant).
Size for VBD, ms—the size of the fixed jitter buffer used for data transmission in the VBD mode
(modem communication). The range of permitted values is from 0 to 200 ms.
Options configuration for 'Transit E1' mode
Some of the options are not used in this mode. Fields which are not used are not displayed and are
not available in 'Transit E1' mode. The rest of the fields are configured as in SIP/SIP-T/SIP-I mode.
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