Clearspan® Product Overview R19
Aastra – 2740-007
2014 Clearspan® is a Registered Trademark of Aastra Technologies Ltd.
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to the appropriate MS ports. The MS uses the RTP protocol to send and receive audio/video. The
HTTP interface is used to pull media files from a storage area.
Media Servers should be geographically distributed, which will minimize call latency and bandwidth
utilization.
Enterprise administrators can choose from multiple codecs that are supported on the Clearspan
Media Servers. Configurable classes of multimedia service can also be assigned to groups and
individual users, restricting callers to the codecs in their assigned set. Enterprise administrators can
opt for lower bit-rate codecs to increase the number of simultaneous calls that can be provided on
an access link to end users. The Media Server supports G.711, G.722 and G.729 codecs.
In addition, the Clearspan system can be configured to route calls differently depending on the
codecs they use, eliminating network elements that do not support included media, or prioritizing
network elements that offer better support for included media.
2.1.2.5
Network Server (NS)
The Clearspan Network Server (NS) enables system administrators to centrally manage network-
related applications within their network. This includes public translations and routing capabilities
such as least-cost routing, as well as enterprise-focused network applications such as voice virtual
private networks (VPNs).
The Network Server allows construction of massive next-generation voice networks by assisting
with the scaling of IP telephony networks and offloading user-specific routing functions. The
Network Server also acts as a platform for network-based enterprise applications such as dial
plans, and supports passing of non-numerical characters like * and # to the network so they can be
used to trigger functionality in other networks.
The Network Server optimizes network resource utilization by providing the capability to selectively
route calls to geographically dispersed resources, thus maximizing network bandwidth utilization.
For example, the Network Server can manage Media Servers as a single network-wide pool of
resources and at the same time, select an appropriate Media Server for the location of the
requesting user. The Network Server also performs a central role in supporting Clearspan
redundancy.
Provisioning new users can occur via synchronization of the group and user data between
Application Servers and Network Servers. The Network Server functions with the Application
Server as shown in the following figure.
