SMG digital gateway 63
ISUP Subsystem
Channels initialization mode—device operations during stream recovery:
– leave blocked—channels remain blocked (BLO);
– individual unblock—the unblock command (UBL) is sent for each channel;
– group unblock—a group command is sent to unblock a group of channels (CGU);
– group reset—the group reset command (GRS) is sent.
Send REL on receiving SUS—sends the REL message in response to the SUS message, which
notifies about channel suspension.
Add a digit in IAM for overlap—sends a single digit to the Called Party Number field of the IAM
message in the overlap dialling mode.
Restrict CdPN in IAM to 15 digits —when checked, limits the number of digits of the CdPN number
sent in the IAM message to 15, while other digits are sent in the SAM message.
Control receiving Redirecting/Original Called for incoming redirection—when checked, a call will
be cleared back if the IAM message contains the Redirection Information parameter, but has no
Redirecting Number or Original Called Number.
IAM Indicators
Transmission medium requirements—specifies the type of information to be delivered by the
transmission environment.
Forward call indications
ISUP preference —a rule that governs modification of the ISUP preference indicator. As a rule,
these bits should not be changed.
Interworking indicator—defines whether the interaction indicator should be modified (defines
whether the interaction has been established with a non-ISDN network).
Call type indicator—determines whether the call type indicator should change its value to
international or national.
Connect type indicators
Satellite indicator—identifies the presence of a satellite channel.
– Override to "no satellite"—changes the identifier value to "no satellite" regardless of the
value received from the incoming channel.
– Unchanged—keeps the indicator value unchanged.
– Add one—this setting is used if the signal link operates via a satellite channel. In this case,
the satellite channel parameter transmitted in the Nature of Connection indicators is
increased by 1.
Enable continuity check —enables integrity check support in the SS-7 line group. During an
outgoing call, the called party establishes a remote loop in the stream, SMG sends the frequency
to the channel that will be detected on receipt after signal transmission through the channel. If
the frequency is detected, the call is handled through this channel; otherwise, a similar attempt is
performed on the next channel. After 3 unsuccessful attempts (on three different channels), the
call service is stopped.
Continuity check frequency —defines the frequency of channel integrity checks during outgoing
calls performed through the SS-7 line group. For example, the value of 3 means that every third
outgoing call will be checked for channel integrity.
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