Media Gateway Control and the Softswitch Architecture in .NET framework

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Media Gateway Control and the Softswitch Architecture
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Terminations MEGACO defines terminations, which are logical entities on an MG that act as sources or sinks of media streams Certain terminations are physical They have a semipermanent existence and may be associated with external physical facilities or resources These would include a termination connected to an analog line or a termination connected to a DS0 channel Physical terminations exist as long as they are provisioned within the MG and are akin to endpoints as defined in MGCP Other terminations have a more transient existence and only exist for the duration of a call or media flow These are known as ephemeral terminations and represent media flows such as an RTP session These terminations are created as a result of a MEGACO Add command, which is somewhat similar in function to the CreateConnection command in MGCP Ephemeral terminations are destroyed by means of the Subtract command, which is similar to the MGCP DeleteConnection command Terminations have specific properties and the properties of a given termination will vary according to the type of termination Clearly, for example, a termination connected to an analog line will have different characteristics to a termination connected to a TDM channel (such as a DS0) The properties associated with a termination are grouped into a set of descriptors These descriptors can be included in MEGACO commands, thereby enabling termination properties to be changed according to instruction from MGC to MG A TerminationID references a termination, and the MG chooses the TerminationID schema to be used Similar to MGCP, MEGACO enables the use of the wildcards all (*) and choose ($) A special TerminationID called Root can also be used This TerminationID is used to refer to the gateway as a whole rather than to any specific terminations within the gateway Contexts A context is an association between a number of terminations for the purposes of sharing media between those terminations Terminations may be added to contexts, removed from contexts, or moved from one context to another A termination can exist in only one context at any time, and terminations in a given gateway can exchange media only if they are in the same context A termination is added to a context through the use of the Add command If the Add command does not specify a context to which the termination should be added, then a new context is created as a result of the execution of the Add command This is the only mechanism for creating a new context A termination is moved from one context to another through the use of the Move command and is removed from a context through the use of the Subtract command If the execution of a Subtract command results in the
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Media Gateway Control and the Softswitch Architecture
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removal of the last termination from a given context, then that context is deleted The relationship between terminations and contexts is illustrated in Figure 6-10, where a gateway is depicted with four active contexts In context C1, we see a simple two-way call across the MG In Context C2, we see a three-way call across the MG In contexts C3 and C4, we see a possible implementation of call waiting In context C3, terminations T6 and T7 are involved in a call Another call arrives from termination T8 for termination T7 If the user wanted to accept this waiting call and place the existing call on hold, then this could be achieved by moving termination T7 from context C3 to context C4 The existence of several terminations within the same context means that they have the potential to exchange media The existence of terminations in the same context does not necessarily mean that they can all send data to each other and receive data from each other at any given time, however The context itself has certain attributes, including the topology, which
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