Reference Architecture

The Reference Architecture was chosen to reflect typical Carrier and Hosting Service Provider Communications and Data-Center Applications Architectures and to provide a clear testing and assurance framework to prove the OpenScape UC Suite in a realistic Carrier configuration.

Two Reference Architectures were used:

• The first represents the typical smaller Hosting Service Provider operating from 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 is the data center, operated by the Service Provider, that houses the central components - OpenScape Voice, the media server(s), DLS, OpenScape UC Application, OpenScape Xpressions Messaging, OpenScape Video, and OpenScape Contact Center. A HiPath MobileConnect is also shown.

PSTN termination can be via PSTN gateways located in the data center, or via 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 Siemens Enterprise Communications NOC for optional managed services.

Managed services offer an easy entry point for the Service Provider so that they can turn up service 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 two data centers, operated by the Service Provider, which house duplicate components in each data center for full redundancy. 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 can be via on-site gateway and OpenScape Branch to provide for survivability, or via centralized PSTN gateways located in each data center, or via SIP trunks to a carrier, which goes via the data center SBCs.

The customer sites 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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