READ Free Dumps For Cisco- 400-051
| Question ID 12887 | Which two types of devices on Cisco Unified Communications Manager support iSAC?
(Choose two.)
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| Option A | MGCP
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| Option B | SIP
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| Option C | SCCP
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| Option D | Music on Hold server
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| Option E | H.323
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| Correct Answer | B,C |
Explanation 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.
| Question ID 12888 | Which ITU-T recommendation defines the procedures for using more than one video
channel in H.320-based systems?
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| Option A | H.324
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| Option B | H.230
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| Option C | H.239
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| Option D | H.264
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| Option E | H.329
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| Correct Answer | C |
Explanation Explanation: H.239 is the ITU standard for a second video channel; this is supported by all the major vendors, and is the only content channel standard supported by Cisco acquired Codian products or Cisco TelePresence Serial Gateway Series products on H.323 video calls. Cisco acquired Codian products need to be configured to enable H.239. Any H.323 endpoint that also supports the H.239 protocol can source this channel, as can a VNC connection, though some endpoints need to be configured to use H.239 instead of their proprietary solution.