Saturday, 7 July 2012

VoIP Service Performance Validation

VoIP Service Performance Validation

EXpert VoIP Test Tools is an EXFO platform-based software application that provides voice-over-IP (VoIP) performance validation for service turn up and troubleshooting in enterprise and service provider networks. Supported on the FTB-1 and FTB-200 platforms, the application generates a single VoIP call from an EXpert VoIP-enabled platform to another EXFO platform supporting the application or any IP phone. The test calls can either be “live” or use a predefined audio file for test traffic. EXpert VoIP supports several signaling technologies including SIP, SCCP, H.323 and H.248 to ensure compatibility with the majority of VoIP environments currently used in the industry.

EXpert VoIP boasts a highly configurable test interface to maximize control over the test parameters yet maintains a strong emphasis on usability. The intuitive user interface features EXFO’s latest generation framework that allows even the uninitiated user the ability to quickly set up and run tests. All tests support a uniform set of quality metrics that include opinion score (MOS), R-factor and a full range of real-time protocol (RTP) loss metrics, which combine with configurable thresholds to simplify service validation or accelerate troubleshooting.
Tests are executed between two EXpert VoIP-enabled platforms or to a VoIP endpoint (such as a SIP proxy server, soft phone or telephone, i.e., ATA). The platform that launches the test initiates a call, sets up a media channel, transmits media and reports statistics. Depending on the endpoint, it answers the call, transmits media and gathers statistics. Service tests can query the endpoint to determine availability or to set up a call.

Key Features

Intuitive user interface for rapid verification of voice quality of VoIP services
Configurable pass/fail thresholds for simplified testing
Supports a wide range of signaling protocols including SIP, SCCP, H.248/Megaco and H.323 to suit most applications
Includes a full range of RTP metrics to support troubleshooting
Supports MOS and R-factor quality metrics
Test configurations can be preconfigured and saved for quick repeatable testing
Detailed reports are available to help track and maintain a record of changes in the service
Available for FTB-1 and FTB-200 based applications
Common tool kit and test interface across all platforms
Product Highlights

RTP Network Test


The VoIP RTP Network test is the base test of the EXpert VoIP Test Tools application. This peer-to-peer test measures VoIP-related parameters by streaming RTP packets between two endpoints. All supported functionality for this test conforms to RFC 1889.
The RTP Network test simulates VoIP traffic by streaming RTP packets between a controller test set, which initiates the packet stream, and a responder endpoint that initiates its own stream to the controller test set.

Signaling Protocols

EXpert VoIP has been designed to support a wide variety of VoIP environments to ensure the maximum utility of the tools. As such the application can be configured to use some of the most frequently used VoIP call signaling protocols including SIP, SCCP, H.248/Megaco and H.323.
Voice Quality Metrics

The EXpert VoIP Test Tools base application includes a full set of voice quality metrics including MOS, R-factor and degradation factors based on codec, latency and packet loss to help pinpoint the source of any voice quality issues. EXFO’s voice quality measurement agent calculates R-factor (another standardized transmission quality rating) for a call based on the G.107 E-model extensions. These model extension factors such as packet loss burst to more accurately predict the subjective score a listener would assign that call. The R-factor is then converted to an EXFO MOS score. The EXpert VoIP tests report the raw R-factor and EXFO’s MOS voice quality results for conversational call quality.

The EXFO MOS algorithm used in the application is based on the ITU-T P.800 recommendation, which provides an objective measurement to subjective testing. EXFO has invested significant resources into developing and refining the EXFO MOS algorithm and it has been successfully benchmarked against leading commercially available algorithms.


Visit to: http://voiptest12.blogspot.com/


Source: http://www.exfo.com/en/Products/Field-Network-Testing/FTB-Ecosystem/Platforms/EXpert-VoIP-Test-Tools/


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