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Systems | Media Gateway

A Media Gateway (MG) function provides the media mapping and/or transcoding functions between potentially dissimilar networks. It is a device that converts data from the format required for one type of network to the format required for another. Due to the diverse nature of the network, media gateways perform multiple functions, including, but not limited to connecting:

• IP to IP (when different protocols or coders are being used)
• PSTN to IP
• PSTN to ATM
• PSTN to PSTN
• ATM to Internet protocol (IP)

Typical Functions

• Reservation and release of resources
• Ability to provide state of resources
• Maintenance of resources, e.g., loopbacks and continuity tests
• Connection management, including connection state
• Media processing such as transcoding, conferencing, etc.
• Digit analysis
• Event detection and signal insertion
• Ability to configure signaling backhauls (e.g., a SIGTRAN backhaul)

Applications

The Media Gateway is typically used on the following applications:

• Trunking Gateway
  - Long distance backhaul
• Access Gateway
  - ISDN, CAS, V5.2, GR-303
• PacketCableTM Gateway
  - CablelabsTM Initiative
  - Opens up the Voice Over Cable space
• Wireless Gateway
  - GSM,CDMA,UMTS,CDMA2000

Signaling Interfaces

Typically Media Gateways are controlled by Softswitches using the following signaling protocols:

• MGCP
• MEGACO (H.248)
• SIGTRAN for transporting ISDN, SS7 traffic to/from softswitch
• ATM (Q.93B, Q.SAAL, etc.)

Bearer Channels

The voice traffic is carried using:

• RTP / RTCP over IP
• ATM

Critical Features

Price/Performance

• The MG market is highly competitive and operators need systems which allow them to serve large numbers of subscribers profitably and cost effectively.

Programmability

• Programmability eases the task of changing features and functionality in an MG, shortens time-to-market, and increases the longevity of the equipment.

Modularity and Scalability

• When designed properly, such systems can effectively add more computing, protocol processing, or I/O functions independently without requiring an entire system upgrade or replacement.

High Availability

• MG's must be designed with carrier-grade reliability. Systems must meet or exceed the industry benchmark of "five-nines" availability. Continuous Computing's DFT / HA helps achieve this.