Cisco 400-051 Exam

Which statement about the iSAC on Cisco Unified Border Element is true?

  • A. It is a narrow-band codec.
  • B. It has a fixed frame of 30 milliseconds.
  • C. It has an adaptive frame of up to 60 milliseconds.
  • D. It is designed to deliver wideband sound quality in high-bit-rate applications only.
  • E. It is not yet supported on the Cisco Unified Border Element (CUBE)
  • F. It is not yet supported on Cisco Unified Border Element.
Answer: Option C.
Explanation: 

iSAC-Internet Speech Audio Codec (iSAC) is an adaptive wideband audio codec, specially designed to deliver wideband sound quality with low delay in both low and medium-bit rate applications. Using an adaptive bit rate of between 10 and 32 kb/s, iSAC provides audio quality approaching that of G.722 while using less than half the bandwidth. In deployments with significant packet loss, delay, or jitter, such as over a WAN, iSAC audio quality is superior to that of G.722 due to its robustness. iSAC is supported for SIP and SCCP devices. The Cisco Unified Communications Manager IP Voice Media Streaming App (IPVMSApp), which includes Media Termination Point, Conference Bridge, Music on Hold Server, and Annunciator does not support iSAC. MGCP devices are not supported.

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