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  5. One Useful Way To Test VoIP Quality: Page 2 of 5
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One Useful Way To Test VoIP Quality: Page 2 of 5

Sage Instruments' neat little 935AT portable unit performs end-to-end call tests to assess overall speech quality.
November 23, 2004
  • Perform a latency test (done with SMOS test);
  • Do an effective bandwidth test ("percentage of bandwidth available" frequency response of the 300--3400 Hz band -- done with SMOS test).

The 935AT (pictured) comes with common 2-wire and 4-wire analog interfaces as well as a T1 interface with dual direction drop and insert capability and many PCM span diagnostics. Access to testing is via standard MF/DTMF/DP signaling features; there's also built in analysis functions for simplified troubleshooting.

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