Zte zxmsg 5200, Technical Manual

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Chapter 6 - Interface and Communication
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(restart, for example, when a great deal of contexts need to be
processed).
iv.
An indicator
The indicator is used in emergency calls to indicate preferential
processing in MG.
2. Termination
The termination is a logic entity in MG, used to initiate/terminate
media or control streams. One termination can have several priorities
that are classified into a series of descriptions and used as command
parameters. When being created, a termination is allocated with a
unique ID (TerminationIDs) by MG. TerminationID uses two kinds of
wildcard mechanisms: ALL and CHOOSE. The ALL is used for multiple
terminations, while CHOOSE allows MG to select a termination that
matches the wildcard condition. For example, MGC can use ALL
commanding MG to select a specified circuit in a user group.
The termination that represents a physical entity exists semi-
permanently, such as a termination for timeslots of a user circuit. The
termination for ephemeral information stream, such as RTP stream,
only exists when being used.
An ephemeral termination can be created with the Add command, or
deleted with the Subtract command. For a semi-permanent physical
termination, the Add command serves to add a termination from a null
context into a material context, and the Subtract command serves to
move the termination into a null context.
The termination can play signal tones. The signal means dial tones and
notification tones generated by MG. MGC can set a termination to
detect some events, such as hook-on/off and hooking pressing. When
the termination detects such events, MG will report these events to
MGC.
3. Root termination
When a command is to operate the whole gateway instead of one
termination, a special termination ID “Root” can be used. The Root
termination can have a priority, event and statistic, but has no signal.
As a result, the Root termination can appear in the following
commands:
Modify: Change a priority or set an event.
Notify: Report an event.
AuditValue return: Check priority and statistic values used by Root.
AuditCapability: Check Root capability.
ServiceChange: Indicate gateway service statuses.
4. Package
Different MGs can have terminations of different priorities. Different
priorities of terminations are embodied that MGC can operate different
priorities, events, signals and statistics for the terminations.
For the interconnection between MG and MGC, these options are
classified into different Packages, with the terminations implementing a