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Q.921
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In this document, the term Q.921-User refers to an upper layer that
uses the services of Q.921 ...
... Q.921-User refers to an upper layer that
uses the services of Q.921, not the user side of ISDN interface [1].
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* Support for transport of the Q.921/Q.931 boundary primitives
* Support for communication between Layer Management modules on SG
and MGC ...
... association will provide the transport for the delivery of Q.921-User
protocol data units and IUA ...
... call processing. For the
purposes of this document, the SG terminates Q.921 and backhauls
Q.931 to MGC ...
... fail-over functions in order to support a
high availability of call processing capability. All Q.921-User
messages incoming to an SG are assigned to a unique Application
Server ...
... Application Server is, in practical terms, a list of all ASPs
configured to process Q.921-User messages from certain Interface
Identifiers. One or more ASPs in the list are normally active ...
... Support for Transport of Q.921/Q.931 Boundary Primitives ...
...
In the backhaul scenario, the Q.921/Q.931 boundary primitives are
exposed. IUA layer needs to support all of the primitives of this
...
... (Q.931) messages that are to be transmitted, or have been received,
by the Q.921 layer using the acknowledged information transfer
service ...
... layer 3
(Q.931) messages that are to be transmitted, by the Q.921 layer using
the unacknowledged information transfer service ...
... ASP moves from the ACTIVE state. The Layer
Management could instruct Q.921 to take some action, if it deems
appropriate.
...
...
The protocol messages for Q.921-User Adaptation require a message
header that contains the adaptation layer version ...
... ASP Traffic Maintenance (ASPTM) Messages
5 Q.921/Q.931 Boundary Primitives Transport (QPTM) Messages
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... SG
shall send the Q.921 Establish Request primitive to the Q.921 entity.
In addition, the SG ...
... entity.
In addition, the SG shall map any response received from the Q.921
entity to the appropriate message to the MGC ...
... entity to the appropriate message to the MGC. For example, if the
Q.921 entity responds with a Q.921 Establish Confirm primitive, the
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... IUA Establish Confirm message. As
another example, if the IUA Layer receives a Q.921 Release Confirm or
Release Indication as an apparent response to the Q.921 Establish
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... IUA Layer receives a Q.921 Release Confirm or
Release Indication as an apparent response to the Q.921 Establish
Request primitive, the IUA Layer shall map these to the corresponding
...
... Interface (BRI), the MGC tries to
send Q.921 Management messages via IUA when Layer Management ...
... Define Value Description
ASSIGNED 0x0 TEI is considered assigned by Q.921
UNASSIGNED 0x1 TEI is considered unassigned by Q.921 ...
... These procedures achieve the IUA layer's "Transport of Q.921/Q.931
boundary primitives" service.
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... Q.921/Q.931 Primitives Backhaul Examples ...