Zyxel IES-5106 [610/1156] H 48 commands

Zyxel IES-5106 [610/1156] H 48 commands
Chapter 17 VoIP
Management Switch Card User’s Guide
610
Statistics are information related to a Termination’s activity in a Context, and are sent to the
MGC on request, or when the Termination is removed from the Context.
17.1.4.2 H.248 Commands
In an H.248 network, the MGC controls calls by issuing commands to the Media Gateways. In turn,
the media gateways can issue reports to the MGC. The commands allow control of Terminations and
Contexts. For example, the MGC can specify what events a Termination should log and report,
which Terminations should exist in which Contexts, and which signals the MG should apply to a
Termination.
Commands and reports are grouped into Transactions. Each Transaction consists of a number of
actions, which must all refer to the same Context. To verify that Transactions have been correctly
sent and received, each Transaction must be preceded by a TransactionRequest message and
concluded with a TransactionReply message. In addition, a TransactionPending message indicates
that a Transaction has been initiated, and is being processed, but is not complete.
The following table lists the H.248 commands.
17.1.4.3 H.248/MEGACO Call Progression Example
The following figure shows two analog telephones (A and B) connected to two media gateways
(MG1 and MG2). MG1 and MG2 are connected to one another via an IP network. MG1 and MG2
are controlled by the media gateway controller MGC.
Table 330 H.248/MEGACO Commands
COMMAND DESCRIPTION
Add Adds a Termination to a Context. If a Termination does not already exist, it is created by
this command.
Modify Alters a Termination’s events, properties and signals.
Subtract Removes a Termination from a Context and sends statistics to the MGC on the
Termination’s activities in the Context. Ephemeral Terminations are destroyed by this
command.
Move Moves a Termination from one Context to another.
AuditValue Sends information on a Termination’s current events, properties and signals.
AuditCapabilities Sends information on all possible properties, events and signals permitted by the MG.
Notify Sent by the MG to the MGC to inform the MGC of events.
ServiceChange Sent by the MG to the MGC, or vice versa, indicating that one or more Terminations is
about to be removed from service, or has been returned to service.

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