Integrated Signaling and Media Processing

Multimedia Border Requirements in All-IP Environments

For several years, carriers have been migrating from circuit-switched networks to more flexible network topologies based on IP. To increase flexibility and reduce costs, carriers initially kept existing circuit switches in place and used media gateways to convert to IP. However, carriers are now taking the next step and building services with all IP-based elements, typically using the SIP protocol. These emerging SIP-based networks offer enormous potential for generating new services and increasing revenue per subscriber, but the introduction of IP throughout the network also creates challenges.

Although carriers often use Session Border Controllers for signal translation and security, most do not include the hardware-based signal processing needed for media transcoding. For all-IP environments, new elements are required that can:

  • Mediate signaling
  • Transcode among different media formats
  • Handle basic security issues

Dialogic offers its Dialogic® BorderNet™ 2020 Integrated Media Gateway to meet these needs.

Multimedia Border Requirements between Network Elements

A BorderNet 2020 IMG is useful where there is a need to translate between the SIP variations used by different vendors in order to produce an enhanced service such as unified messaging. The illustration “Multimedia Border Requirements between Network Elements” shows how a BorderNet 2020 IMG can be used between network elements. In this example, A SIP-based softswitch supporting SIP over UDP needs to communicate with a hosted voice platform that uses SIP over TCP. The BorderNet 2020 IMG provides SIP mediation between the two platforms and media transcoding between the platforms for tones or voice. In this situation, the 2020 IMG plays a role much like a PSTN-to-IP media gateway, but the connections on both sides are IP-based. The 2020 IMG provides value by reconciling the signaling and the media between the softswitch and the voice platform, and by performing these functions using a single, small form factor device.

Multimedia Border Requirements between Network Elements

Multimedia Border Requirements between Network Elements [11533, 1]

Multimedia Border Requirements on the Network Edge

Another role for a BorderNet 2020 IMG is to provide an intelligent link at the network edge between two different IP networks. Carriers have often used SBCs in this role, but in cases where there are requirements for media transcoding between the networks, a BorderNet 2020 IMG can offer a more comprehensive approach.

The illustration “Multimedia Border Requirements on the Network Edge Example” shows how a BorderNet 2020 IMG can be used on the network edge. In this example:

A carrier must handle telephony traffic that is sent from a softswitch to the network edge, and then sent across a network boundary. The traffic needs to cross the network boundary in order to connect to a feature server controlled by a service provider who offers hosted services on the Internet.

The carrier needs to use SIP to connect to the feature server, but also wants extra protection for the signaling, so it issues a request for SIP over TLS to the feature server.

The service provider wants to conserve bandwidth, so it requests that the media be converted from uncompressed G.711 voice into compressed G.729.

The carrier wants to mask its IP topology when communicating with the service provider, so it uses the back-to-back user agent of the BorderNet 2020 IMG to shield the internal IP addresses of the carrier from the service provider.

In this example, the BorderNet 2020 IMG provides value to the carrier by securing the signaling for passage across the Internet, transcoding the voice media per the requirements of the service provider, and masking the carrier’s IP topology.

Multimedia Border Requirements on the Network Edge

Multimedia Border Requirements on the Network Edge

Learn More about the Dialogic® BorderNet™ 2020 Integrated Multimedia Gateway

The Dialogic® BorderNet™ 2020 Integrated Multimedia Gateway (IMG) enables interworking between IP and PSTN networks via high-density optical, telephony, and Ethernet connections in a compact 1U form factor. The BorderNet 2020 IMG’s enhanced Voice over IP (VoIP) density offers the potential for significant reductions in capital and operating expenses when compared to earlier generations of gateways.

For more details, go to the product page.

More Information

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Dialogic® BorderNet™ Products — Interwork and Connect Seamlessly and Securely at the Network Edge