Testing Wireless Voice Quality White Paper

A customer’s experience of voice quality extends beyond the physical network, as environmental issues and user equipment can have a profound impact on how a call sounds. The user’s environment and equipment impact the voice quality for a subscriber even in a perfect RF environment because they directly affect the speech signal input. Recognizing this issue is important because customers are becoming less tolerant of voice problems.

Existing industry voice quality tests focus on the network, primarily radio frequency (RF), and not on the speech signal. RF- and codec-focused tests are not unimportant, but they provide a severely limited assessment of the overall customer experience. In addition to focusing only on network component performance, existing voice quality tests are intrusive, requiring the injection of sampled speech signals and measurement of the post-processed signal. This methodology provides no insight into the number of customer calls impaired by the user’s environment or sub-par equipment.

Ditech Networks provides the industry’s first and only live monitoring of environmental and user-equipment-related impairments on every call, all the time, providing transmission Rating (R) Factor and Mean Opinion Score (MOS) values on the combined measured impact of background noise, echo, and audio level impairments.

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