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The normal, "active" context might have a physical termination (say, one DS0 in a DS3) and
one ephemeral one (the RTP stream connecting the gateway to the network). Contexts are
created and released by the MG under command of the MGC. A context is created by adding
the first termination, and it is released by removing (subtracting) the last termination.
A termination may have more than one stream, and therefore a context may be a multistream
context. Audio, video, and data streams may exist in a context among several terminations.
8.2 Commands
The commands defined by megaco are very simple, since they can be heavily extended using
packages.
8.2.1 Sent from controller to gateway
Add

Used to add a termination to a context
Modify

Used to modify an existing termination
Substract:

Used to remove a termination from a context
Move:

used to move a termination to another context (call-waiting is achieved by moving it to the
NULL context, which keeps it opened).
AuditValue

Returns the current values of properties, signals and statistics
AuditCapabilities:

Returns metadata on the current termination (the possible values for all elements)
8.2.2 Sent from gateway to controller
Notify

Carries an event defined in one of the packages [P1]
ServiceChange:

Notifies the controller that the gateway is going out of service / back in service. [P1]