CHAPTER38 CRP Overview
Mediant 800 Gateway & E-SBC | User's Manual
38 CRP Overview
The device's Cloud Resilience Package (CRP) application enhances cloud- based or hosted
communications environments by ensuring survivability, high voice quality and security at
enterprise branch offices and cloud service customer premises. CRP is designed to be deployed at
customer sites and branches of:
■ Cloud-based and hosted communications
■ Cloud-based or hosted contact-center services
■ Distributed PBX or unified communications deployments
The CRP application is based on the functionality of the SBC application, providing branch offices
with call routing and survivability support. CRP is implemented in a network topology where the
device is located at the branch office, routing calls between the branch users, and/or between the
branch users and other users located elsewhere (at headquarters or other branch offices), through a
hosted server (IP PBX) located at the Enterprise's headquarters. The device maintains call
continuity even if a failure occurs in communication with the hosted IP PBX. It does this by using
its Call Survivability feature, enabling the branch users to call one another or make external calls
through the device's PSTN gateway interface (if configured).
■ The CRP application is available only if the device is installed with a License Key
that includes this feature. For installing a License Key, see License Key.
■ For the maximum number of supported CRP sessions and CRP users than can be
registered in the device's registration database, see Technical Specifications.
For cloud providers, CRP ensures uninterrupted communications in the event of lost connection
with the cloud providers’ control systems. For distributed enterprises and contact centers, CRP is
an essential solution for enterprises deploying geographically distributed communications solutions
or distributed call centers with many branch offices. CRP ensures the delivery of internal and
external calls even when the connection with the centralized control servers is lost.
Table 38-1: Key Features
Survivability
Quality of
Experience/Service
Security
■ PSTN fallback
■ WAN redundancy
■ Local mode
■ High availability
■ Emergency calling (E911)
■ Basic call routing between registering users and
device, or any other route to responding server
■ Short number dialog (short numbers are learned
dynamically in the registration process)
■ Survivability indication to IP phone
■ Call hold and retrieve
■ Call transfer (if IP phone initiates REFER)
■ Basic Shared Line Appearance (excluding correct
busy line indications)
■ Call waiting (if supported by IP phone)
■ QoE monitoring
■ Call Admission
Control
■ SLA fulfillment
■ SIP mediation
■ Media
transcoding
■ Test call agent
■ Layer 3 to
7
protection
■ Media
encryption
■ Call
control
encryption
■ NAT
traversal
■ Topology
hiding
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