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MGC
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... ISDN Signaling Gateway (SG) to a Media Gateway
Controller (MGC) as described in the Framework Architecture for
...
... Q.921/Q.931 boundary primitives
* Support for communication between Layer Management modules on SG
and MGC
* Support for management of SCTP ...
... entity serving a specific
application instance. An example of an Application Server is a MGC
handling the Q.931 and call processing ...
... Application Server. Examples of Application Server Processes are
primary or backup MGC instances.
Association ...
... SCN protocol and
backhauls the upper layer(s) to MGC for call processing. For the
purposes of this document, the SG ...
... ASPs in the event of failure or unavailability of the
currently used ASP (e.g., from primary MGC to backup MGC). Fail-over
...
... currently used ASP (e.g., from primary MGC to backup MGC). Fail-over
also applies upon the return to service ...
... Q.931 signaling messages to the
MGC where the peer Q.931 protocol layer exists, as shown below:
...
... that will facilitate communication between Layer Management modules
on the SG and MGC. These primitives are shown below:
M-TEI STATUS ...
... SCTP
association(s) between the SG and MGC. The IUA layer can be
instructed by the Layer Management ...
... The ASP status is stored inside IUA layer on both the SG and MGC
sides. The M-ASP STATUS primitive can be used by Layer Management ...
... channel. IUA layers on both SG and MGC MAY maintain the status of
ISDN Terminal Endpoint Identifiers ...
... signaling
channel has been established. The MGC controls the state of the D
channel. When the MGC ...
... MGC controls the state of the D
channel. When the MGC desires the D channel to be in-service, it
...
... Establish Confirm or Establish Indication. If the timer expires, the
MGC would resend the IUA Establish Request message and restart ...
... restart the
timer. In other words, the MGC MAY continue to request the
establishment of the data link on a periodic basis until the desired
...
...
If a response to the Release Request message is not received, the MGC
MAY resend the Release Request message. If no response is received,
...
... MAY resend the Release Request message. If no response is received,
the MGC can consider the data link as being released. In this case,
signaling ...
... ASP if it received a defined and recognized
message that the SG is not expected to send (e.g., if the MGC
receives an IUA Establish Request message ...
... channel is shown below. An active association between MGC
and SG is established (Section 5.1) prior to the following message
flows ...