Reference Architecture

We chose Reference Architectures that reflect typical carrier and hosting service provider communications and data center applications architectures. They are designed to provide a testing and assurance framework to prove the OpenScape UC Suite in a realistic carrier configuration.

We chose two Reference Architectures:

• The first represents the typical smaller hosting service provider using a single data center.
• The second is a dual data center architecture with geographical node separation typical of a larger carrier.

Single Data-Center

At the top of the Reference Architecture is the service provider’s data center that houses the central components: OpenScape Voice, the media server(s), DLS, OpenScape UC Application, OpenScape Xpressions Messaging, OpenScape Video, and OpenScape Contact Center. We also have included HiPath MobileConnect.

PSTN termination is via PSTN gateways located in the data center, or a SIP trunk to a carrier, which goes via the SBC. In the center is the WAN connectivity to the remote customer locations, remote users via the Internet, and a connection to our NOC for optional managed services.

Managed services allow service providers to ramp up their services before their technical staff is fully trained and ready to support the system. The customer sites show one location with an existing PBX with a gateway to connect it via SIP to OpenScape Voice, another SOHO location with no survivability or local PSTN termination, and a third site that has an on-site SIP proxy and gateway for local survivability and PSTN termination and a local WLAN access point to provide for VoWiFi.

Dual Data-Center with Geographic Node Separation

At the top are the service provider's two data centers, which house fully-redundant components in each data center. These components are:

• OpenScape Voice
• OpenScape UC App
• OpenScape Xpressions
• OpenScape Video (via UC clients only as integrated – Project Specific for HD, Conference Centers etc)
• OpenScape Contact Center 
•  Media servers

PSTN termination is via on-site gateways and OpenScape Branch to provide for survivability, centralized PSTN gateways located in each data center, or SIP trunks to a carrier, which goes via the data center SBCs.

The customers' sites includes a legacy PBX to provide for trunking across the IP network, a SOHO that has only phones and no gateways or survivability, and a third branch with a local gateway and OpenScape Branch for full survivability in the event of a WAN outage.

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