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ISDN
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... upper layer that
uses the services of Q.921, not the user side of ISDN interface [1].
Examples of the upper layer ...
... signaling protocol
delivery from an ISDN Signaling Gateway (SG) to a Media Gateway
Controller (MGC ...
... Interface - For the purposes of this document, an interface supports
the relevant ISDN signaling channel. This signaling ...
... channel MAY be a
16-kbps D channel for an ISDN BRA as well as 64-kbps primary or
backup D channel for an ISDN PRA ...
... ISDN BRA as well as 64-kbps primary or
backup D channel for an ISDN PRA. For QSIG, the signaling channel ...
... This document defines an adaptation module that is suitable for the
transport of ISDN Q.921-User (e.g., Q.931) messages.
...
... In a Signaling Gateway (SG), it is expected that the ISDN signaling
is received over a standard ISDN ...
... The M-TEI STATUS primitives are used to request, confirm, and
indicate the status (assigned/unassigned) of an ISDN Terminal
Endpoint Identifier (TEI).
...
... IUA layers on both SG and MGC MAY maintain the status of
ISDN Terminal Endpoint Identifiers (TEIs) and Service Access Point
Identifiers ...
... message that includes a TEI that has not been assigned or recognized
for use on the indicated ISDN D-channel.
...
... any additional parameters.
In the integrated ISDN Layer 2/3 model (e.g., in traditional ISDN
...
... In the integrated ISDN Layer 2/3 model (e.g., in traditional ISDN
switches), it is assumed that the Layer Management ...
... Q.931 layer are co-located. When backhauling ISDN,
this assumption is not necessarily valid. The TEI Status messages ...
... ITU-T Recommendation Q.920, 'Digital Subscriber signaling System No. 1 (DSS1) - ISDN User-Network Interface Data Link Layer - General Aspects' ...