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 platform, this application generates a single VoIP call from an EXpert VoIP-enabled platform to another EXFO platform supporting the application or to any IP phone; test calls can either be live or a predefined audio file can be used as test traffic. With its highly configurable test interface, EXpert VoIP maximizes control over test parameters yet maintains a strong emphasis on usability. Featuring EXFO’s latest generation framework, EXpert VoIP provides even uninitiated users with the ability to quickly set up and run tests.
EXpert VoIP boasts a highly configurable test interface to maximize control over test parameters and maintain a strong emphasis on usability. The intuitive user interface enables even the uninitiated user to quickly set up and run tests. All tests support a uniform set of quality metrics including mean opinion score (MOS), R-factor and a full range of real-time protocol (RTP) loss metrics that combine with configurable thresholds to simplify service validation and accelerate troubleshooting.
Tests are executed between two EXpert VoIP-enabled platforms or to a VoIP endpoint (e.g. 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.
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. Specifically, the RTP network test simulates VoIP traffic by streaming RTP packets between a controller test set, which initiates a packet stream, and a responder endpoint that initiates its own stream to the controller test set. All supported functionality for this test conforms to RFC 1889.
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. Our voice quality measurement agent calculates an R-factor for a call based on the G.107 E-model extensions. These model extension factors, such as packet loss burst, more accurately predict the subjective score a listener would assign to a call. The R-factor is then converted to an EXFO MOS score. The Expert VoIP test reports the raw R-factor and EXFO’s MOS score to better reflect conversational call quality.
The EXFO MOS algorithm is based on ITU-T P.800 which provides an objective measurement of subjective testing. We have invested heavily into developing and refining the EXFO MOS algorithm and it has been successfully benchmarked against leading commercially available algorithms.
Telecom service providers are focusing more than ever on bundling multiple services such as voice, video and data. In addition to saving time and money for customers, the bundling of these services provides significant cost-associated benefits. This has also led to increased demand for complete test solutions provided by one vendor, and better yet, on one tester.