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Context describes the topology and the media mixing and/or switching
parameters if more than two Terminations are involved in the association.
There is a special Context called the null Context. It contains Terminations
that are not associated to any other Termination.
Contexts are identified by a Context_Id which is assigned by the MG and is
unique within the MG.
H.248 Message Structure
A message is an information unit sent or received by the H.248 protocol.
In the H.248 protocol, one or more commands are encapsulated in a
message.
The H.248 message mechanism is shown below.
H.248 Message Structure
Message
