SVI_MGC SS7 Media Gateway Controller
The SVI_MGC provides a media gateway controller that controls third party media gateways (Cisco, Audiocodes, Nuera, Lucent, etc) to provide them with SS7 capabilities and to control routing for all protocols on the media gateway including ISDN, R2 and CAS allowing for comprehensive PSTN breakout to VoIP networks.
A media gateway would provide TDM to VoIP media conversion whilst the SVI_MGC SS7 Media Gateway Controller provides all call control protocol termination controlling the media path setup via the standard MGCP or MEGACO media gateway control protocols. With the added advantage of having an optional on board SS7 signalling gateway module the SVI_MGC opens up the PSTN network to all MGCP/MEGACO enabled media gateways.
Multi-Protocol Support
The SVI_MGC SS7 Media Gateway Controller provides a single system that can support multiple protocols across multiple media gateways.
SS7
A SS7 VoIP interconnect has three main components - SS7 Signalling Gateway (SG), Media Gateway (MG) and Media Gateway Controller (MGC). The SG provides a TDM connection into the SS7 network, terminates the SS7 signalling only and backhauls the SS7 information over IP to the MGC. The MG provides the media conversion terminating all TDM bearers and providing progress tones and prompts under the direct control of the MGC using media control protocols like MGCP or MEGACO. The MGC provides the central protocol termination, routing, service provision, inter-working and control of setting up the media paths on the MG.
The SG can be a separate item as shown above or located within the MG or MGC as shown below. The SVI_MGC Media Gateway Controller has a solution for all of these different kind of interconnects.
Squire Technologies provides these three solutions as separate products.
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Media Gateway without SS7 Signalling Gateway Capabilities
The Media Gateway Controller has the capability of having the SS7 Signalling Gateway resident on the same platform as the SVI_MGC, the SVI_SG terminates directly into the TDM SS7 network via E1, T1 or J1 connectors terminating all layers of the SS7 protocol direct on the SVI_MGC platform.
The onboard SVI_SG has full onboard cross connect capabilities allowing for a TDM timeslot to be switched to any other TDM timeslot on any other TDM interface. This allows for any bearer channels that are located on the signalling interfaces terminated on the SVI_MGC Media Gateway Controller to be switched out on a different TDM interface, this TDM interface can then be connected directly to a media gateway.
Media Gateway with SS7 Signalling Gateway Capabilities
Some media gateways have onboard SS7 SG capabilities terminating the SS7 signalling direct on the MG (SVI_MG SS7 Media Gateway). The SS7 layers are then transported across IP to the SVI_MGC using the SIGTRAN family of protocols.
Distributed Model
When using an MG with SG capabilities a centralised SVI_MGC can control multiple territorial POPS (points of presence). This reduces the need for a SVI_MGC at each POP which would require individual configuration and management. The use of this distributed architecture also heavily reduces the network
