Media Gateway Control and the Softswitch Architecture in Visual Studio .NET

Generate Data Matrix in Visual Studio .NET Media Gateway Control and the Softswitch Architecture

Media Gateway Control and the Softswitch Architecture
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Media Gateway Control and the Softswitch Architecture
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Enable the establishment of media streams according to certain quality of service (QoS) requirements and to change QoS during a call Enable the reporting of QoS statistics from an MG to an MGC Since the MGC is not involved in the media transfer, it has no visibility of quality considerations such as delay, jitter, and packet loss and will need to be informed for network management purposes Enable the reporting of billing/accounting information such as call start and stop times, the volume of content carried by media flow (such as the number of packets/bytes), and other statistics Support the management of associations between an MG and an MGC, such as the capability for a given gateway to be controlled by a different MGC in the case of failure of a primary MGC Support a flexible and scalable architecture, whereby different MGs with different capacities and different interfaces may be controlled by an MGC Facilitate the independent upgrade of MGs and MGCs, including the use of a version indicator in message exchanges
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Protocols for Media Gateway Control
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As mentioned earlier, several protocols have been written for media gateway control Of these, two have been widely embraced The first of these is MGCP (RFC 2705) This is an interesting document in that it is purely an informational RFC (rather than a standards-track protocol), even though it includes a protocol specification The reason why it is categorized as informational is because it is being succeeded by MEGACO/H248 However, work on MEGACO started much later than MGCP Even while MGCP was still an Internet draft, many systems developers proceeded to include it within their product development rather than wait for MEGACO Therefore, the decision was taken to release the MGCP specification as an informational RFC RFC 2885 was the first release of MEGACO/H248 as a standards-track protocol It was subsequently discovered that the protocol had some errors, and a separate RFC (RFC 2886) was prepared to document the errata and propose appropriate corrections Subsequently, the original RFC was updated, and a new RFC (RFC 3015) was published and included the necessary corrections to RFC 2885 Thus, RFC 3015 is now the official version
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Media Gateway Control and the Softswitch Architecture
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of MEGACO version 1 As of this writing, version 2 of the MEGACO specification is being prepared at the IETF and ITU The second version adds some new capabilities and modifies some aspects of the version 1 specification Although MEGACO is clearly the way forward for media gateway control, many systems developers continue to implement MGCP within their systems, and MGCP specification enhancement work continues at the IETF In this chapter the description of MGCP is based on the latest draft update to RFC 2705 Given that MGCP and MEGACO are both popular, we describe both in this chapter
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MGCP is a master-slave protocol in which controllers, known as call agents, control the operation of MGs The call control intelligence and related call signaling is taken care of by the call agent, while the MG takes instruction from a call agent and basically does what the call agent commands The commands from the call agent generally relate to the establishment of connections and the teardown of connections from one side of the gateway to another In most cases, the call agent tells the MG to make a connection from a line or trunk on the circuit-switched side of the gateway to a RealTime Transport Protocol (RTP) port on the IP side of the gateway, as depicted in Figure 6-4 MGCP only addresses the communication between a call agent and an MG and does not address communication from one call agent to another
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